Hendrix's version of Hey Joe is better known than Billy Roberts' original version.
There's an artist in Nashville named Chris Stapleton that has written songs that ended up hits for others, but not for him so much. Not sure why, I think he's badass. He used to have a bluegrass band called the SteelDrivers and now he's got a bluesy rock thing called the Jompson Brothers. And Adele is also making a hit out of one of the bluegrass songs about killing your wife. Better known than his - up to you if it's "better".
SteelDrivers Adele
