During the Eagles' most commercially successful period (the late '70s), the press seemed transfixed on Don Henley, Glenn Frey, Joe Walsh, and Timothy B. Schmit, rather than the mysterious man in the background, guitarist Don Felder. But in addition to the group's trademark vocal harmonies, it was Felder's guitar harmonies that proved to be an important ingredient to the Eagles' sound (not to mention composing all of the music to one of rock's all-time greatest tracks, "Hotel California," including its epic guitar solo). Additionally, Felder was one of the group's longest-stand...