sometimes i worry that i'll die and no one will have an easy means to navigate through all the great music that i've been lucky enough to collect. so this.
Santana - Practice What You Preach 
The opening track of side two of Santana's 1974 album, Borboletta, "Practice What You Preach" consists of two sections that add up into something wonderfully unique. It begins with an extended psychedelic duet between Carlos Santana' guitar and Tom Coster's Hammond organ before blossoming into a gem of spiritual proto-disco, all with a little something to say thanks to the vocals from the band's lead singer of the time, Leon Patillo.