At my gigs, mostly dinner music, it is:
1. Music loud enough to be heard, but not too loud to distract or interfere with conversation.
2. Song selection(related to #1)
3. Mingling.
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.