I'm quite happy to admit that I pay no attention to the lyrics in songs, even when I'm really listening to music. I'm sure I'm missing out on a lot of thought provoking material, but frankly, if I wanted to pay attention to other people's thoughts, I'd be at the pub. It also means I'm perfectly happy listening to music in other languages, or instrumentals, and don't feel like anything is missing (although it is nice to sing along).