Evolution: The Best of Iron Butterfly

Evolution: The Best of Iron Butterfly is the fifth and first greatest hits album released in 1971 by American rock band Iron Butterfly. Songs come from four of their albums: Heavy, In-A-Gadda-Da-Vida, Ball and Metamorphosis.

Side one

 * 1) "Iron Butterfly Theme" (Doug Ingle) – 4:34
 * 2) "Possession" (Ingle) – 2:41
 * 3) "Unconscious Power" (Ingle, Danny Weis, Ron Bushy) – 2:29
 * 4) "Flowers and Beads" (Ingle) - 3:05
 * 5) "Termination" (Erik Brann, Lee Dorman) - 2:50
 * 6) "In-A-Gadda-Da-Vida" (45 RPM single edit) (Ingle) – 3:10

Side two

 * 1) "Soul Experience" (Ingle, Bushy, Brann, Dorman) – 2:50
 * 2) "Stone Believer" (Ingle, Bushy, Dorman) – 5:20
 * 3) "Belda-Beast" (Brann) – 5:46
 * 4) "Easy Rider (Let the Wind Pay the Way)" (Ingle, Bushy, Dorman, Robert Woods Edmonson) – 3:06
 * 5) "Slower Than Guns" (Ingle, Bushy, Dorman, Edmonson) – 3:37

Band members

 * Doug Ingle – lead vocals (except where indicated), organs
 * Ron Bushy – drums
 * Jerry Penrod – bass on side 1 tracks 1–3
 * Darryl DeLoach – tambourine and backing vocals on side 1 tracks 1–3
 * Danny Weis – guitars on side 1 tracks 1–3
 * Erik Brann – guitars on side 1 tracks 4–6 and side 2 tracks 1 and 3, lead vocals on "Termination" and "Belda-Beast"
 * Lee Dorman – bass and backing vocals on side 1 tracks 4–6 and side 2 all tracks
 * Mike Pinera – guitar on side 2 tracks 2, 4 and 5, additional lead vocal on "Stone Believer"
 * Larry "Rhino" Reinhardt – guitar on side 2 tracks 2, 4 and 5