It's been fairly random lately, as my daughter is really into music now (and likes everything, but especially anything uptempo). Obviously I do need to watch the lyrics, since she's old enough now to repeat things.
My boss's daughter used to camp out in the back of my office listening to the music when he'd bring her in then be in meetings all day. I had a spare external hard drive laying around, so I gave her a copy of my mp3 collection.
My boss was very annoyed with me when she did a school presentation on her favorite poet, Lydia Lunch.