L.T.D. - Love To The World (1976)

Production from the Mizell Brothers, and that's all you really need to know! J Dilla sampled "Love Ballad" for De La's "Much More", and there are a couple other tracks that could be sampled. Get it here.

Arthur Adams - I Love X7 My Lady (1979)

Guitarist Arthur Adams put this album out in 1979... It's more or less soul, but it's got a more bluesy feel to it. Get it here.

Get his other album "Home Brew" from 1975 here.

John Blair - Southern Love

John Blair was (he may have died, I can't find any info) an electric vitar (violin/guitar) player who has worked with people anywhere from Roy Ayers to Stevie Wonder... This LP from 1976 was co-produced by the late John Hammond... got a soulful (with a slight fusion feel) to it. Nothing really sample-wise, in my opinion, but it's good music nonetheless. Get it here.