Klaus Voormann
In 1974 Keltner played on the Lennon-produced Harry Nilsson album "Pussy Cats" alongside Ringo (and Keith Moon) on "Rock Around the Clock". Keltner was featured on the Nilsson albums "Son of Schmilsson" with Harrison, Starr and Beatles associate Klaus Voormann as well as "Duit on Mon Dei" with Starr and Voormann.