Steve Winwood's "Gimmie some lovin" - It's a classic riff that I want to play each time I hear the right organ patch. "Whiter Shade of Pale" too... for the quiet moments
Rhodes? How bout Stevie Wonder's "Livin for the city", or Herbie Hancock's "Camelion"?
Clav - "Superstition" or "Higher Ground"(Stevie!)...no surprise - Stevie Pioneered the instument !
Piano - "Feelin Alright" Joe Cocker, or "Rootbeer Rag" - Billy Joel.