I never knew Michael McDonald sang backing vocals for Steely Dan. Just now having listened to Peg, I can't see how I never recognized his voice in the chorus.I quite enjoy this duo...
Michael H. McDonald is an American singer, keyboardist, and songwriter. Known for his distinctive, soulful voice, he was a backing vocalist for Steely Dan from 1973 to 1980 and the lead vocalist of the Doobie Brothers across various stints. (Wikipedia)
-Eric