I know some people that sing along to every song that comes on the radio, know the words to songs I've never even heard of and can hold a tune.
I'm not one of those people. I sometimes know some of the words, but hardly ever all or even most...
Except when it comes to ABBA!
I had one of my ABBA cd's playing yesterday as I did chores and to my absolute delight discovered that I know ALL the words to MOST of their songs. And boy was I singing along... (And pretending I have a really good voice!)