Cally- thats a nice idea- listening to all the sounds.

I introduced the game- who can be quiet the longest DS1 cracks up when I suggest this now.
I have always hit my boys up about repetition- I'll say- I just told you that.
We also make it clear- the adults are talking you need to either wait until we have finished or say excuse me (and when they are older, to say excuse me- and I'll say, okay just wait a min so&so is talking)
Tantrums wil happen cause they are being told to do something, stick to your guns but also work out what is realistic for him and teach it slowly. I have seen 10yr old kids who have never been made to wait their turn or say excuse me throw tantrums when adults are talking and "ignoring them" so im not sure it is just a phase. IMO its a skill that must be taught its just part of sharing really