I wake up to the same song every morning?

I fall asleep listening to my iPod every night and every time I wake
up, the same song is playing. It's 1/160 chance of me waking up to it,
and I always do. It's called Therapy by All Time Low. It's really
weird, but it's an amazing way to wake up. I was just wondering why I
kept waking up to the same song? Even if I wake up in the middle of
the night.