Here are The Byrds performing ‘He Was a Friend of Mine’ live at the Monterey Pop Festival in 1967. The track is actually a traditional folk song covered by many artists in this era. But I think the Byrds do it so well with Mcguinn on the low harmony and Crosby on the high. Not to long after this performance, Crosby would leave the group. You can kind of feel the tension just watching them perform together at Monterey.