To add my comments although it may be an older question. Our church services split between a "classical" musical service with organ and piano with the occational woodwind or brass treat. Our later service offers a more contemporary "rock" stype of music with multiple electric and acoustic guitarts, bass player, drummer, and again the occational brass or woodwind addition. 

I would suggest chatting with your leaders of the congregration and see if they would be open to a similar format. I can tell you that we have a higher turn out in the later service by many younger families and there is alot of enjoyment of worship with this upbeat style of music.