Prelude (Happiness, I'm So Glad) Album: Hard Road: The Mark 1 Studio Recordings 1968-69 - Shades Of Deep Purple 1968 (Stereo Mix) (CD2)Artist: Deep Purple Listen and download
Prelude (Happiness, I'm So Glad) Album: Hard Road: The Mark 1 Studio Recordings 1968-69 - Shades Of Deep Purple 1968 (Mono Mix) (CD1)Artist: Deep Purple Listen and download
Prelude, Happiness - I'm So Glad (Medley) (2000 Remaster) Album: 100% Deep PurpleArtist: Deep Purple feat Happiness?, Medley Listen and download