[4][5] In 1968, Samuel, Isidore and guitarist/singer Wendell Richardson formed the psychedelic rock/soul trio The Sundae Times, and recorded an album of original songs, Us Coloured Kids, produced by their friend Eddy Grant of The Equals.

At Island Studios in January 1970 they began recording for Stills' first solo album, which includes the hit single "Love the One You're With", and contributions by Jimi Hendrix and Samuel's friend Isidore.

After touring with CSNY, he became a founding member of Stills' super-group, Manassas, a band which brought together rock, folk, blues, country and Latin rhythms.

From the 1970s, through to the 1990s, Samuel worked with musicians in the UK and US including Rita Coolidge, Dr. John, Marianne Faithfull, America, Alvin Lee, Steve Winwood, Mick Taylor,[8] Kevin Ayers, and Taj Mahal.

In the early 1990s, Samuel was a member of Bobby Keys' band, Tumbling Dice, along with other Rolling Stones associates Mick Taylor, Nicky Hopkins, and Ivan Neville.