There is a new CD coming out that contains two long out of print Sly & the Family Stone "comeback" albums "Back on the Right Track" and "Ain't But the One Way." They will be back in print ona new, limited edition (5000 copies) CD titled: SLY AND THE FAMILY STONE 'Who In The Funk Do You Think You Are: The Warner Bros Recordings'

You can order it and get much more information at:

http://www.rhinohandmade.com

Here is a bit where they directly refer to Prince:

SLY AND THE FAMILY STONE continue to remain a major influence on modern day Funk 'N' Roll artists, most notably PRINCE, who has based many of his bands, including The Revolution and The New Power Generation- on a formula patterned on SLY AND THE FAMILY STONE's large, and deliciously diverse, ensemble.