Geoff Muldaur may have been overshadowed by his former wife, Maria Muldaur. They made a few albums as a duo, then went their respective separate ways. Guesting on Motion are Dr. John, Jesse Ed Davis, Martin Mull, Cindy Bullens, Klaus Voorman, Jim Keltner, Jim Price & Bobby Keys. Maria does appear on Is Having a Wonderful Time, along with John Cale, Richard Thompson, Benny Carter, Joe Farrell, Merle Saunders & Ron Carter.