Heart and Soul is called the piece every piano student loves, and every piano teacher hates. Why? It can go on, and on, and on, over the same simple ground, without end--like a zombie.
This, however, is a testament to the musical genius of Hoagy Carmichael, one of my favorite pop composers.
The version I learned, which I sometimes, with the feeling of walking by a graveyard at night, teach, is a duet.