Country rock was still finding its footing when Don Henley started playing, but he knew it was best to follow the call of Los Angeles rock and roll.

The Eagles have already made timeless music together, but one of their masterpieces might have some shades of Jethro Tull woven in its musical fabric.

Glenn Frey used them as cautionary tales. Find out which bands Frey was determined to outdo with the Eagles, below.