Today's Piano Puzzler

The guest this week is Roger Reynolds from Ashland, Virginia.  I got the hidden song almost immediately, and it's one of the least-hidden songs that Bruce Adolphe has done, so I suspect most people will get it.  I have a feeling that the reason it's so poorly hidden is because it overlaps not not a composer style, but an existing piece of music.  Alas, as absolutely familiar and recognizable as that music is...I just couldn't name it.