It's tough to do things with that age group sometimes. The biggest challenge for them is to worship in spirit and in truth NO MATTER WHO'S LOOKING AT THEM...
The biggest thing you can do for them right now is expose them to other youth who are on fire for the Lord. There's strength in numbers. If they feel like they are the only teens/young adults in their community that sing and dance, they will not push themselves to engross themselves in worship.
Just continue to show the true love of Christ and eventually they will come around. Most of the uninspired singers in my youth choirs are the ones being "forced" to sing "or else". Make a move to discover their true motive for being in the choir. If it is truly because their momma or daddy said so, then talk with their parents and give your blessing for them to join the usher board or security team... Once those who don't want to be there aren't there anymore, you can focus your energy on the ones who want to be there. One more thing, it is VERY important that you get started training them to direct, sing, and even play for themselves. The sooner you take yourself OUT of the picture the more the kids will respond to the challenge. If you're doing EVERYTHING for them like selecting ALL the songs, selecting ALL of the movements, selecting all of the color schemes/attire etc... is it really THEIR CHOIR or is it YOUR CHOIR and they do what YOU say? Also since they are old enough to handle things, have them select their own officers to plan out trips, concerts, social events etc... then they will blossom and enjoy themselves soooo much that they will recruit other singers who love to sing...
Good advice - will take that to heart.
Have been going through a similar thing w/our kids+youth (yes, it's one choir). In addition, on Youth Sunday they call ALL the kids up to sing, not just the ones who attend rehearsal. I have seen the non-singing kids joke around, say out loud "I'm not gonna be in the choir", or stand there with blank looks on their faces, distracting and de-motivating the ones who DO want to sing.
Have talked with some youth and the leadership, but parents told me they gave their kids no choice to be ushers or whatever, they 'had' to be in the choir. So I -
- Simplified and cut down their songs (1 instead of 2, more Sunday-School kid songs like "Arky, Arky", cut the parts down to melody, use commercial tracks and shorten them to under 3 min.) Told them we cannot do Gospel songs like "Souled Out" unless they sing out.
- Made CD/Lyric packages of the songs for the next few months to give out to the parents, to sign out for and thus get some parental involvement.
- Am trying to do more 'kid-friendly' activities w/them (without extending our short rehearsal time too much) like having the little ones dance like raindrops on a rainy day, then doing a bit of 'Didn't it Rain, Children'.
I know we all have a long way to go, and I have lots of room for improvement. Any thought or suggestions?