Thanks to the recent high-rotation in our house, of the Woody Guthrie's Songs to Grow On, I cannot get those songs out of my head. Particularly the one that goes "Put your finger in the air, in the air" (or is it "put your finger in yer ear, in yer ear"? When I lie in bed at night, if I don't fall asleep instantly my head becomes haunted by his cute ditties about going 'round and around in a circle, building a house for the baby-o and taking people for a ride in his car-car.
Our Baby Einstein DVDs get quite a bit of usage too - I put one on first thing in the morning to keep The Little Madam out of trouble while I shower, and another one at the end of the day so she'll not try to climb into the bath when I'm filling it with hot water.
But because we've played Baby Neptune so many times now, I can't hear Strauss's The Blue Danube without mentally inserting "Quack quack, quack quack" at appropriate points in the music (it accompanies a bathtub scene featuring syncronised-swimming rubber ducks - it's great).
Just as I was telling a couple of fellow parents I'd just met the other day, having a child sure has opened up a whole new world to me.