Janet Dilbeck clearly remembers the moment the music started. Two years ago she was lying in bed on the California ranch where she and her husband were caretakers. A mild earthquake woke her up. To Californians, a mild earthquake is about as unusual as a hailstorm, so Dilbeck tried to go back to sleep once it ended. But just then she heard a melody playing on an organ, "very loud, but not deafening," as she recalls. Dilbeck recognized the tune, a sad old song called When You and I Were Young, Maggie.
Dilbeck endured this mystifying condition on her own for months, until she paid a visit to a San Francisco doctor. She had come to see him about her Lyme disease, which had plagued her since 1993. As they reviewed her symptoms, she told him about the songs. Her doctor informed her that she had a little-known medical condition called musical hallucinosis. She belonged to a small but significant number of people who heard music that simply wasn't there. (Found at boingboing)
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.