After Green left Fleetwood Mac in 1970, he worked with Watson on two solo singles, "Heavy Heart" and "Beasts of Burden", the latter being credited to both musicians.
Watson also accompanied Green as conga player on a tour of the United States with Fleetwood Mac in February and March 1971.
Jeremy Spencer had suddenly left the band and they asked Green to fill in and help them fulfil their tour obligations.
Watson was at that time the brother-in-law of Fleetwood Mac's manager Clifford Davis.
Green was not always comfortable taking centre-stage when playing live, and Watson provided an extra focus onstage, singing as well as playing lead guitar.