Conversation so far:
what was tenure with the eagles?
forming the Eagles, with Frey playing guitar and keyboards and Henley playing drums.
what formed the eagles?
Frey and Henley decided to form a band together while on the tour, and they were joined by Meisner on bass and Leadon on guitar, banjo.
who else joined?
Frey and Henley.
did they tour?
The Hell Freezes Over Tour followed.
what did he do after the tour?
The Eagles' album Long Road Out of Eden was released in 2007.
how did that album do?
CANNOTANSWER.

Question: what was his greatest accomplishment?
Self-contained rewrite: what was the Eagles greatest accomplishment?