Paula - I couldn't agree more. What you are doing sounds much like what I did some thirty years ago.

Although I had a 'school choir', I should clarify that any child could be a member if they wished to give up part of their lunch break and stay after school for twenty minutes twice a week.

In other words, the only criterion for selection was that they wanted to sing!

Here in Lancashire (UK) there is an expression 'Cock of the School' which is the 'badge of honour' earned by the boy who could hold his own against any other boy in a hand-to-hand fight. The school staff were always perplexed as to why the 'Cock' was a member of the school choir...!! I must have been doing something right!! ;o)