Papal choirs began in the 5th century and Gregory the Great reorganized the Schola Cantorum (school of singing) in Rome which trained Christian choirs throughout the Roman empire. These trained performers reflected the Greek culture mindset which was built around the audience-performer dynamic.
But then came the Reformation. John Huss (1372-1415) was among the first to bring singing back to the people in church, although the choir remained in order to direct the congregation. Not until the middle ages do we see musical instruments accompanying the singing. Many church fathers believed musical instruments were associated with immorality and idolatry. However the organ was first used in churches in the 6th century. As choirs grew they came to be seated up on chancel (clergy platform), and its members wore fancy ecclesiastical robes.
I don't know about you, but I really enjoy the worship part of church!. The music moves me and gets me thinking about God and His goodness. It's a fun time. So what's the problem? The problem is that special stage musicians leading worship is not found anywhere in the New Testament. Instead we see phrases from Paul like "Every one of you hath a psalm" 1 Corinthians 14:26 and "Speak to one another with psalms, hymns and spiritual songs" Ephesians 5:19 In other words, everyone has the privilege of singing their praises to God, not just a select few who are following a pre-determined schedule and list of songs. Nor should we allow only those few to tell us what and when to sing!