I've been on the worship team at my church in the past and it was a simple sit down we had with the people causing the "complaint" but the sit down was by the pastor on our behalf. We expressed that all matter of music can be pleasing to the ear and as long as we were singing out of joy and making joyful music that brought edification to God we were "ok" and there isn't anywhere in the Bible detailing how we are to express our joy to the Lord through music. ---- Now for some context --- Our church was a free church and I was 17 (now 24), We were a "rock" group that kept up and could play Hillsong titles and we would basically take the oldie goodies and beef them up with some drums, electric guitar, and two female vocals and myself as a semi-lead male voice, Oh and of course bass and piano. We would do about a 4-7 song set that would range from a quite piano song, to a raging banger explosion worship song near the end. What we learned from doing such a variety was we were attracting lots of new people and ticking off all of the regulars who thought this music thing would pass and go back to normal once the "youth band"(newly assembled) was good and could be told and would learn their songs the way they liked them. The issue was simply style. People change over time and what they like changes too. Churches capture people in time in many ways I feel and it is most evident in worship tastes. I've learned through being a part of 7 different churches through the years that it is best to ignore the desires of the old generation who are completely in their own time zone and move on to music that captures the real meaning of worship and to even write your own songs and teach them to the church. I was never really that talented with music so I moved on but some of the others have gone on to lead their own worship bands in churches and even made a few of their own bands outside of church. kinda just a spill of thought and others might have a completely different experience and advice.