All the time! It hurts to be shown that you were wrong about something, but it's a good opportunity to learn something new.
I couldn't have learnt any languages had I not learned to 'eat' humble pie, hehe :)
詳しくは知らないけど、曲は一つ二つ聞いたことがあります。
PVを見るたびに人数が多くて驚いちゃいます(笑)