Sing

I know almost every song on the radio. No matter what it is, I always sing along. Why is that I sing along to every song whether I like it or not. I suppose one reason is that I love to sing. I'll sing anything. When I listen to the radio the songs are just there, so I just sing them. I could change the radio station, but I guess I'm too lazy sometimes. Well laziness or love of singing; I've developed one strange habit.