He released two solo albums, 1989's "Coast to Coast", and 1993's "The World's Most Dangerous Party", produced by rock musician Todd Rundgren. Shaffer has also recorded with a wide range of artists, including Donald Fagen, Ronnie Wood, Grand Funk Railroad, Diana Ross, B.B. King, Asleep at the Wheel, Cyndi Lauper, Carl Perkins, Yoko Ono, Blues Traveler, Jeff Healey, Cher, Barry Manilow, Chicago, Luba, Robert Burns, George Clinton, Bootsy Collins, Nina Hagen, Robert Plant, Peter Criss, Scandal, Brian Wilson, "Late Show" regular Warren Zevon, jazz trumpeters Miles Davis and Lew Soloff, jazz saxophonist Lou Marini, and bluegrass legend Earl Scruggs. In 1982, he co-wrote "It's Raining Men" with Paul Jabara. It was number one on the US "Billboard" Hot Dance Club Play charts, a number-two hit in the UK for The Weather Girls in 1984, and a UK number-one remake for Geri Halliwell in 2001. Shaffer and the World's Most Dangerous Band performed the Chuck Berry song "Roll Over Beethoven" for the 1992 film "Beethoven".