Country music artist Merle Haggard died Wednesday on his 79th birthday.

Merle Haggard and Willie Nelson play the pilot show for ‘Inside Arlyn’ at Arlyn Studios. Gary Miller/Courtesy of Arlyn Studios.

His passing prompted many reactions, including this one from his longtime friend and collaborator, Willie Nelson.

Many others took to social media to comment on Haggard’s death.

The most poignant message is from his son and lead guitarist, Ben.

Charlie Daniels and TG Sheppard were the two artists to first break the news via Twitter Wednesday.

Country music has suffered one of the greatest losses it will ever experience Rest in peace Merle Haggard

— Charlie Daniels (@CharlieDaniels) April 6, 2016

My dear friend and one of country music's treasures @merlehaggard has just passed away. My deepest sympathy to his family.

— TG Sheppard (@TGSheppardmusic) April 6, 2016

Austin music institutions like Waterloo Records and Austin City Limits Live sent messages expressing grief on Twitter, and Broken Spoke changed its cover photo on Facebook to honor the outlaw country star.

We’ll miss you Merle.

— Waterloo Records (@WaterlooRecords) April 6, 2016

We'll miss you and your incredible contributions to the music we love, @merlehaggard. 📷: @AlisonNarropic.twitter.com/O4GYmVt1K5

— ACL Live (@acllive) April 6, 2016

Our hearts are with this beloved Okie from Muskogee's friends and family. @merlehaggard's legend will live on. pic.twitter.com/9DIvkPb6wl

— Austin360 Amp (@Austin360Amp) April 6, 2016

And, as evidenced by the host of messages from the celebrities, country music artists and journalists below, Haggard’s influence spread far and wide.

By dying on his 79th birthday, the great Merle Haggard leaves us like the subject of a Merle Haggard song. RIP.https://t.co/fSlH7CxJl2

— Chuck Carlton (@ChuckCarltonDMN) April 6, 2016

Just hearing the Merle Haggard news. Thankful for a man that was a shining beacon of honest songwriting and vocal grit. RIP, Merle!

— Grady Smith (@gradywsmith) April 6, 2016

literally just fell to the floor. can't believe we lost the hag. rip merle haggard

— Dierks Bentley (@DierksBentley) April 6, 2016

Merle Haggard was the best country songwriter there ever was.

— Jason Isbell (@JasonIsbell) April 6, 2016

There are no words to describe the loss & sorrow felt within all of music with the passing of Merle Haggard. Thank God for his life & songs.

— Brad Paisley (@BradPaisley) April 6, 2016

Love and prayers for the Haggard family. Merle was a pioneer…a true entertainer…a legend. There will never be another like him.

— Carrie Underwood (@carrieunderwood) April 6, 2016

This hit us in the gut. We'll be having another "Merle" night on the bus this weekend. Condolences to his family https://t.co/pb6camGXs5

— Josh Abbott (@joshabbottband) April 6, 2016

We've lost an American original. RIP Merle Haggard. Today was his birthday too. ❤️❤️❤️ pic.twitter.com/8erKSIh6SA

— Johnny Knoxville (@realjknoxville) April 6, 2016

Okie from Muskogee. Poet of the Common Man. Hag. RIP, @MerleHaggard. Your talent & influence will never be forgotten pic.twitter.com/Y3ze89WWZR

— ACM Awards (@ACMawards) April 6, 2016

hats off for the Hag. RIP. 😦 https://t.co/PszbF6p4M3

— Corb Lund (@CorbLund) April 6, 2016

I think I'll just stay here and drink. 💔

— KACEY MUSGRAVES (@KaceyMusgraves) April 6, 2016

Another legend lost. Playing "Misery & Gin" in your honor, Merle. pic.twitter.com/Z5MAT0S7XB

— MAREN MORRIS (@MarenMorris) April 6, 2016

Rest easy @merlehaggard 💔 pic.twitter.com/5rvHR47pAd

— Margo Price (@MissMargoPrice) April 6, 2016

Photo cred: Ben Haggard pic.twitter.com/kC8A7BCKMt

— Sturgill Simpson (@SturgillSimpson) March 15, 2016

This list will be updated throughout the day.