Alphabet Book by Paul Lansky is an amazing CD. According to the artist, "The inspiration came from the TV show, Sesame Street, where the celebration of letters and numbers, those atoms of daily life, is often clothed in lively musical garb." It is Sesame Street by way of Laurie Anderson.
I have found it helpful to do the stretching exercises my physical therapist recommends. Do some core strengthening exercises, such as the ones highlighted at The Mayo Clinic. By keeping your core strong, your back won't put itself in a position to cause that sciatica pain you are having.