As is the case with most of the material on their previous two albums, the songs of "Deep Purple" mix elements of progressive rock, hard rock and psychedelic rock, but this time in a darker and more baroque atmosphere. Perhaps in response to British audiences craving more blues-based rock, the band also incorporated a 12-bar blues structure on the songs "The Painter" and "Why Didn't Rosemary?" "Emmaretta" is a pop rock song written to be a commercial single, but the sound of the album is heavier and more guitar-oriented than previous works, similar to how the band sounded live during this period.