"Procol Harum" was released in September 1967 in the US, and three months later in the UK. Though the album was recorded on multitrack, it was issued as mono-only in the UK, and in mono and rechannelled stereo in the US. Despite extensive searching, the original multitrack tapes have not been located and thus a stereo mix of the original ten tracks may never be possible. Several alternate takes, however, have been mixed into stereo and are available on CD. As recently as 2004, the original single, mixed to stereo, has appeared on a "Dick Bartley Presents: Classic Oldies" compilation on Eric Records.