On Monday, country great Dolly Parton posted the hastag to her 4.9 million followers in support of Davis.
A native of Lubbock, Texas, Davis got his break as a songwriter in 1969 when Elvis Presley recorded his works "In the Ghetto," "Memories" and "Don't Cry Daddy."
His songwriting catalog includes "Everything a Man Could Ever Need" (sung by Glen Campbell), "Something's Burning" (a hit for Kenny Rogers & the First Edition), "Watching Scotty Grow" (Bobby Goldsboro) and "I Believe in Music" (a hit for Gallery that's been recorded by over 50 artists).
Davis also enjoyed fame as a singer the 1960s and 1970s with his Grammy-nominated "Baby Don't Get Hooked on Me," "Stop and Smell the Roses" and more, and he hosted and starred in his own musical variety TV series on NBC from 1974-1976.
In 1974, Davis was named the Academy of Country Music's Entertainer of the Year, he received a star in the Hollywood Walk of Fame in 1998, was inducted into the Nashville Songwriters Hall of Fame in 2000 and elevated into the national Songwriters Hall of Fame in 2006.