Chris Lange: guitar, slide-guitar, bass and percussion on all tracks; piano on tracks 5 and 6. Gilbert Gfeller: harmonica on tracks 8, 9, 11 and 14; piano on tracks 10, 11 and 14; drums on track 7. Recorded in Zürich/Switzerland May 27, 1967 (tracks 1-3 and 7); May 28, 1967 (track 4); June 6, 1967 (track 11); June 7, 1967 (track 8 and 14); July 25, 1967 (track 9); July 26, 1967 (track 10); September 1967 (track 13) and April 1969 (tracks 5 and 6).