In our Cub Scout Group (8-11 year olds), we sing various action songs, where the young people have to do certain things at various points of the song. So, on 'My Bonny lies over the Ocean' we start sitting but stand up when we hear a word beginning with the letter B. Then sit down when the next one comes along. The chorus 'Bring back my bonny to me' prompts a lot of movement and getting out of sequence. Also in this vein we do 'Father Abraham' 'Sunshine Mountain' and 'Singing in the Rain' all with actions, and I'm working up a version of Louden Wainwright's 'Last Summer I went Swimming'. These songs are good if you are faced with a bunch of energetic/noisy 9 year olds (especially boys) - you need to burn off some of their energy before they will sit down and sing/listen to quieter songs.

Other things which can then work well are Rounds - there's a good few in the 'Rise Up Singing' book.

And then there are ballads, where there are many different protagonists. In a song like 'Sir Patrick Spens' someone can sing the line of the King, someone else do the 'bonny boy sitting at the king's right knee', another be the mermaid, and the strongest singer can be Sir Patrick Spens!

best of luck!
KP