I went to a Christmas Carol 'sing-a-long' at the Royal Albert Hall, and there were many impeccably behaved school age children singing beautifully. Unfortunately, I was seated near to a couple with a four year old who intermittently screamed between playing with his noisy hand held electronic game. The only response to his attention seeking behaviour was to ram more sweets down him. Luckily, there were spare seats available, and an attendant moved me during the interval well away from him. I'm not really sure why his parents took him (they didn't seem to paying much attention to the music either), and neither did they appear to have any concerns about his behaviour.