Which Eagles song was co-written by Bob Seger?

Heartache Tonight was the Eagles song co-written by Bob Seger. Seger shared writing credit with Don Henley, Glenn Frey, and J. D. Souther on the track, which appeared on the Eagles' 1979 album The Long Run.

The song grew from a writing session involving Frey and Souther. Frey called Seger and sang him the developing verse, after which Seger supplied the chorus idea. Henley, Frey, Souther, and Seger then completed the song. Glenn Frey handled the lead vocal on the Eagles recording.

Released as a single in 1979, “Heartache Tonight” became the Eagles' final number-one song on the US Billboard Hot 100. It also won the Grammy Award for Best Rock Performance by a Duo or Group with Vocal. Listeners sometimes confuse Seger's role with that of a guest performer: he did provide backing vocals on the recording, but the question's key fact is his co-writing credit. The other listed songs were written by Eagles members and different collaborators.