A children's choir from British Columbia had their renditions of several pop/rock songs recorded and press to vinyl in the 1970's. A new CD has been created from this. Hear a nine year old sing a heart wrenching version of "Desperado" and a trippy "Space Oddity." I would buy this just to see what "I'm Into Something Good" sounds like. There are short mp3's of several of the songs on the site.
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.