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"Possession" b/w "Evil Temptation" is a rare single recorded by Iron Butterfly between 1967 and 1968, but not released until 1970 for unknown reasons. The first side is "Possession", which is the same version from their earlier single, "Don't Look Down on Me".
On the flip side is "Evil Temptation", an instrumental. Like many of Iron Butterfly's songs from the Heavy era, "Evil Temptation" is simple and based entirely on a single riff. The lineup is mostly unknown, though Erik Brann has been confirmed as the guitarist. Doug Ingle denies having played on the recording, and has pointed out that the drumming sounds distinctly unlike Ron Bushy. It is possible that, Brann's guitar work aside, the recording is actually the work of studio musicians. However, the song itself is an Iron Butterfly composition, and a version with lyrics by Darryl DeLoach was performed during the band's early tours. A recording of this non-instrumental version can be heard on the album Live at the Galaxy 1967.