Once again, I point out that I DO use the transpose button myself, for that very reason (familiarity with a song in one key, needed in another). But if you can't play in certain keys at all (as some here profess), you can't play certain songs, no matter WHAT key you start in.

That's all I've been trying to say. Transpose button is fine, but there are way too many songs with outside key sections that defy it's use. FAR better to be able to play in any key when needed, than to miss out on so many songs because you can only play a few keys and use the transpose button on simple songs rather than knuckle down and learn each key.....