Так уж получилось, что на первой стороне подобрались композиции записанные первоначальным составом Deep Purple.

Ritchie Blackmore - guitar
Rod Evans - lead vocals
Jon Lord - organ, keyboards, backing vocals
Ian Paice - drums
Nick Simper - bass, backing vocals

А на второй стороне вторым составом или как его ещё называют "классическим" (утверждение спорное, мне лично, больше нравятся альбомы записанные первым составом).

Ritchie Blackmore - guitar
Ian Gillan - vocals
Roger Glover - bass
Jon Lord - keyboards, Hammond organ
Ian Paice - drums

The Deep Purple Singles A's & B's is a compilation album of singles released by the British hard rock band Deep Purple. It was released on vinyl in October 1978. An updated version of the album was issued on CD in 1993 and contains the complete collection of Deep Purple's UK singles, recorded and released from 1968 to 1976 by the Mk I, II, III and IV line-ups of Deep Purple. In 2010 EMI released another double CD compilation album called Singles & E.P. Anthology '68 - '80. It contains all songs as herein plus 15 tracks. The song "Kentucky Woman" is present in the album version, which is 38 seconds longer than the single edit.

Side A:

Ritchie Blackmore - guitar
Rod Evans - lead vocals
Jon Lord - organ, keyboards, backing vocals
Ian Paice - drums
Nick Simper - bass, backing vocals

Side B:

Ritchie Blackmore - guitar
Ian Gillan - vocals
Roger Glover - bass
Jon Lord - keyboards, Hammond organ
Ian Paice - drums