Hmmmm. Interesting. Should sing, shouldn't sing. Only in tune, not you slackers at the back. And what's with the banging? Under 15s at an evening game. Shouldn't they go to bed when they've finished their homework?. Friendlies should only have friendly singing? Is that a rule? Replays should only have songs we've sung before? Is that another rule? Should it be? Fascinating. Live long and prosper