I was reminded how much I enjoyed listening to I’ve Seen That Face Before, by Grace Jones.  In her version of Libertango lyrics and an altered melody are superimposed over this Astor Piazzolla piece.  This concept is not new, and it is quite effective.  Another very good example would be the Ave Maria, by Charles Gounod, where the basis for the piece is the first prelude from the Well Tempered Clavier, by J. S. Bach.  The jazz piano improvisation below is played over a track that I produced using a piece by, Oretade Ravanello.  The piece has a tempo marking of Andantino expressivo.  I started with a keyboard sound and then added bass guitar and drums/percussion.  I love playing to this track.