Piers,

nice little story that. But I think though the point Tom was making is at that stage of practicing the song, you're *not* concentrating on it at all - you're concentrating on driving. It's that 'singing while not actually thinking about it' which helps (some people) cement the song, *after* they've done the heavy concentrating on getting the words in their head... Running through the song at that satge shouldn't take any more concentration than listening to a cd or the radio, and may take less, depending on what's on!

Kahl may have not been able to listen to music 'in the background' without giving it his full attention - fair enough. But some people can.

Different strokes, different folks.