Okay, I'm involved with 4 different christian music groups so bare with me...
At my local anglican church I lead the music group. I play trumpet or guitar depending on which works best for the song. The songs are normally used as like a musical interlude between parts of the service, but when the music group leads the singing part of the worship, at some stage in the service we will use 2 or 3 songs to lead people into a time of prayer or praise depending on where we feel God leading us. The congregation consists mostly of older people (60+) and they are used to more 'traditional' hymns, which makes introducing new songs hard work. The music group consists of a drummer, a pianist, a flute, a violinist, a trumpeter, and a guitar player.
The local baptist church has a much wider age range of worshipers, and the order of the songs in relation to the rest of the service is much more liberal. I only play when there is a youth service on, but I do not lead the worship, because I will be preaching at some stage in the service. The music group consists of a 2 flutes, a pianist, a drummer, a keyboard player, a bass player, an acoustic guitarist, and occassionally myself on trumpet/guitar, and my brother on violin. The exact make up of the group will vary according to the songs being sung.
The local youth church has a time of praise right at the start of the service consisting of about 30-40 minutes of singing and praise through music. The songs are generally more modern than at the baptist church (although the baptist church encourages new songs), and the lack of pews allows for dance and jumping to be a way of expressing our praise. The music group consists of 2 singers (one guy and one girl), an electric guitar, an acoustic guitar, a bass guitar, a keyboard, and a drummer.
And finally, the Christian Union at my university leads worship at the start and end of each C.U meeting. The mood will vary from week to week, but we will usually do songs with different tempos so that we can lead into a time of prayer, or praise, as is appropriate. The music group includes 2 guitars, a bass, a pianist, and a viola.
I enjoy all of these forms of worship, but I think I most struggle with leading worship at my local anglican church, because of the general lack of enthusiasm when it comes to singing. But I'm
ing about it.