Beverage functions serve an important purpose: They give guests a way to socialize and network. They offer a chance to visit in a relaxed, leisurely setting. New acquaintances are made and old ones rekindled. Job openings are circulated. Hot tips are exchanged. And the seeds of many successful business dealings are planted.
Given that the point is socializing, don't have the music at an opening reception so loud that guests must shout. Save the loud music for the closing evenin