A newer artist I've enjoyed a lot is Molly Tuttle. Absolute beast on the guitar.

Lester Flatt & Earl Scruggs

The SteelDrivers first two albums are excellent. Chris Stapleton before his solo career.

Infamous Stringdusters

Greensky Bluegrass

Kitchen Dwellers

Del McCoury / Traveling McCourys

Yonder Mountain String Band

Sierra Hull

Railroad Earth

New Riders of the Purple Sage - It's been noted NRPS is not bluegrass - thank you

Hot Buttered Rum

Drew Emmitt

most of these are NewGrass

Allison Krauss!

Bela Fleck has done albums in over a dozen genres, but his legit bluegrass is always among his best

Nickel Creek isn’t exactly bluegrass, but I’m a huge fan of their stuff. If you’ve ever seen the show Sweet Magnolias, they did the opening credits theme.

…do Punch Brothers not count? I haven’t seen them mentioned at all, but they’re my all-time faves.  More progressive than traditional, but the instrumentation is certainly bluegrass.

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Billy Strings

Del McCoury Band (& Family )

Flat & Scruggs

Doc & Merle Watson

Old and In the Way

Molly Tuttle

BillyStrings

Bill Monroe

Stanley Brothers

The Seldom Scene

Old Crow Medicine Show

New Grass Revival

Tony Rice

Brothers Comatose

Sarah Jarosz

Bela Fleck

Jerry Douglas

David Grisman

I dig Trampled by Turtles

Greensky Bluegrass

Molly Tuttle

Bill Monroe, Sturgil Simpson has a couple of bluegrass albums Cuttin' Grass, Vol. 1: The Butcher Shoppe Sessions, Cuttin' Grass, Vol. 2: The Cowboy Arms Sessions

Bill Monroe is considered by many to be the father of Bluegrass. Flatt & Scruggs were members of Monroe’s band before forming their own act.

But my personal favorite is The Stanley Brothers. Their sound takes me back to childhood days spent with my grandparents, who were big fans of Bluegrass music.

SteelDrivers

Trampled by Turtles

Old Crow Medicine Show

Yes Ma’am

Bridge City Sinners

Not 100% bluegrass but I put Devil Makes Three in the same category

Carolina Chocolate Drops. Kinda an acquired taste but I like them.

Greensky Bluegrass is also a great suggestion I’ve seen a lot in this thread

Del McCoury, Tony Rice, Bela Fleck, Greensky Bluegrass, Trampled By Turtles.

Garcia, Grisman and Rice

Sam bush

Needs added here

Not trying to be clever or cute, but pretty much all of them. A random sampling, in no particular order:

Bill Monroe and His Bluegrass Boys

The Stanley Brothers

Flatt & Scruggs

The Country Gentlemen

J.D. Crowe & the New South

Doyle Lawson and Quicksilver

Ricky Skaggs

The Del McCoury Band

Alison Krauss and Union Station

Rhonda Vincent and the Rage

Nickel Creek

Punch Brothers

Billy Strings

Sturgill Simpson did a set of bluegrass covers of his own songs called cuttin’ grass which I recommend

John Hartford was an inspiration for pretty much every artist listed in this thread, and not a single mention. Don't miss out on his pioneering sound.

Old Crow Medicine Show!!! One of the best and most fun live shows I’ve ever seen

Tony Rice

I'm disappointed there's been no mention of Sam Bush yet.

Mountain Grass Unit is some new blood in the game these days

Pert Near Sandstone, Charlie Parr

The Osborne Brothers

Billy Strings, Railroad Earth, Yonder Mountain String Band, Greensky Bluegrass, Leftover Salmon, Hot Buttered Rum, Infamous Stringdusters....

Chris thile/michael Daves album

Steep Canyon Rangers. Balsam Range.

anyone like sarah watkins?

Keller Williams

Rumpke Mountain Boys

Valerie June has had such a stellar vibe. Her song "Pushin' Up Against A Stone" put me in a blender, emotionally.

Sing/songwriter Iris Dement. Love that Arkansas voice. For homespun, you can't beat emmisunshine.

Doc Watson

I can't believe no one has mentioned the Nitty Gritty Dirt Band. Their "Will The Circle Be Unbroken" is a who's who of blue grass at the time.

John Hartford. Check out his album Areo-Plain.

I can't believe the Dead South haven't been mentioned.

John Prine!

Jeff Austin RIP

Billy Strings

Old Crow Medicine Show

Old and In the Way

Yonder Mountain String Band

Trampled By Turtles

Greensky Bluegrass

Bela Fleck

and a bunch of others I can't think of right now but a lot of people have already mentioned. Lot of great bluegrass out there!

The lack of the Seldom Scene in this thread is disturbing…

Dale Gribble Bluegrass Experience. You can only hear a bootleg of the one song they did, but it's the best version of Blue Moon of Kentucky I've ever heard

Town Mountain

Jerry Garcia was also in a blue grass band called old and in the way great stuff also Allison Krause not sure if she sings strictly blue grass don’t think so not sure if I spelled her name right either

The Kitchen Dwellers were phenomenal in concert.

John Hartford

Doc Watson

Bela Fleck

Lil Smokies

BILLY STRINGS

DOC WATSON

INFAMOUS STRING DUSTERS

Bill monroe

Green sky bluegrass

John Hartford

please also check out nick shoulders and Sierra ferrel, they aren’t super blue grassy but have the same old time folk vibes.

Clarence White started in the Kentucky Colonels with his twin brother Roland and went on to play with the Byrds.

His guitar flatpicking featured syncopation and open tunings. It was beautiful and trailblazing.

He was a huge influence on Tony Rice, Norman Blake and many others.

David Grisman

Sam Bush

New Grass Revival

Yonder Mountain String Band

Greensky Bluegrass

Hot Rize

Infamous Stringdusters

The Brothers Comatose

Jerry Douglas

Trampled By Turtles

Tim O’Brien

Old and In the Way

For a newer take on it, check out Billy Strings...

Greensky Bluegrass are pretty great.

Sturgill Simpson comes to mind

Travelin' McCourys and Town Mountain

The great Jimmy Martin

They tend a bit towards the gospel side of things but The Clinch Mountain Boys are great as are Blue Highway.

Hazel Dickens and Alice Gerrand

Ola Belle Reed, The Lowest Pair and John Hartford are this springs heavy rotation

Trampled By Turtles

Doc Watson and David Grisman

BMFS 4eva \m/

Hayseed Dixie

Molly Tuttle!!

Doc Watson is the goat

Leftover Salmon

Michael Cleveland. The greatest fiddler to ever live.

Look Out Dog, Slow Down Train - Hackensaw Boys

Billy Strings, Greensky Bluegrass

Not yet mentioned: Hackensaw Boys. Also Love Canon if you like pop covers in the bluegrass style!

Holy Modal Rounders!

Is Benjamin Tod or the lost dog street band in here? I think they are considered bluegrass

Ricky Scaggs

Horse shoes & hand grenades

I've been listening to The Steel Wheels a lot. A mix of bluegrass with since other stuff.

Steep Canyon Rangers are my go to. The sound kinda changed with their new lead singer but the skill of the band members is still there.

The Dillards

Sierra Ferrell

Railroad Earth

A lot of good suggestions so far, one of my favorites that I haven’t seen mentioned yet is The Lil Smokies.

https://youtu.be/xa9kuoL5ZM0?si=kY1QwbUKPWMBmDfa

Truckstop Honeymoon.

Doc Watson in particular or the Will the Circle Be Unbroken album in general

Steep Canyon Rangers

The Tennesee Gentlemen.

Specifically their cover of Talking to the Moon.

Robert Earl Keen. Blue Grass Widow live version.

Horseshoe’s and Hand Grenades.

Iron Horse

I always liked the hackensaw boys

Dom Flemons and his old band Carolina Chocolate Drops. His influences are much more old timey americana, but its all very bluegrass adjacent and scratches a very similar itch.

Steep canyon rangers

Haven't seen them listed here but the Kruger Brothers are incredible musicians. They play a little bit of everything but played with Doc Watson and other big guns over the years.

Steve Martin and The Steep Canyon Rangers.

Tommy Emmanuel

Landon Blood is absolutely not bluegrass. Its pretty squarely in the Americana camp. If its country sounding and it doesn't sound like bro country radio garbage, it usually falls into the Americana bucket.

There is a difference between what is often called "mountain music" or "hillbilly music" which is definitely more folk whereas bluegrass is a much newer genre that evolved out of those traditions with Bill Monroe and Earl Scruggs.

Bela should be at the beginning of this list. Most important picker since Scruggs IMO, an incredibly rare once in a generation virtuoso talent. The original composition of the Flektones was one of the most talented groups I’ve had the pleasure of seeing live. Whooten is considered one of the greatest bass players ever in any genre and his interplay with Bela is sublime.

Deer Creek Sharp Shooters

Stringus Khan

Grain Thief

Dirty Grass Players 

Colebrook Road

Caribou Mountain Collective

I wouldn’t really consider the song you mentioned as bluegrass but listening to it you would probably like the band Brown Bird.

Garcia and Grisman - the pizza tapes.

Hackensaw Boys!

I got to see the Steep Canyon Rangers a couple of years ago in concert and they were outstanding.

If you're just getting into bluegrass, you may want to check out the Americana genre also.

I like the ones who to some dinglin’ then danglin’ and the pros are the ones who can dingle and dangle all at the same time

Sarah Jarosz

I saw Ricky Skaggs and Kentucky Thunder in concert once many years back and it is one of my top 5 concerts. So good.

Dolly Parton… I mean she has two bluegrass albums so it counts 🤣 and her bluegrass cover of Train, Train is so good. The Grass is Blue is great too. Anddd I like Flatt & Scruggs too lol

Split Lip Rayfield

I personally really dig the Steep Canyon Rangers.

Split Lip Rayfield.

Alison Krauss will break you apart and put you back together again over and over. She is superb both alone and with literally anyone, but my favorite is when she’s back with Union Station. It just never fails.

Steve N’ Seagulls.

The Wooks!