Dear Jon, My experience as a participant and occasional leader of singalongs has been that it is very hard to get early teens to join in for pure singing. However, if you can get a guitar into their hands, and give them about two lessons they will put up with anything. They are desperate to learn how to play the guitar! If you round up as many guitars as you can find, and have someone give a crash course in the basics of chording and progressions on the guitar with as many of the kids in your troop as possible, using the songs you want to have them sing as the repertoire, then you will be away. What you need for the singsong is one adult player, and as many kid players as possible: the rest will (in my experience) sing along just to be part of the group because every teenager wants to be where there are massed guitars. To keep them interested in what you want them to sing, you (or whoever is doing this) will probably have to find one or two of their latest hits and work out the progressions, which are probably the usual three chords anyway. Yours, Peter