As Rick mentioned above, Jane Field has written a number of songs on the topic of disability. The one Rick refered to and one about sex "Disabled People Do It Too", 'We may not have the agility but we have the ability'. (I'm sure there are more but those are the 2 I remember right now.)

At the Toronto Song Circle last Friday she said that she is always looking for the positive things about being quadraplegic and although there are darn few one of them is that there is always someone to harmonize with in the shower. She then proceeded to teach us a tongue twisting round that she learned from her attendant that morning.