Even though I mainly play and record with bands and singers, I do play at parties and weddings and receptions, and so have a set up ready to go. For these I usually play my alto sax unamplified, with backing tracks trough a small speaker system. I do have a slightly larger PA, but I'm not really wanting to do big parties replacing the disco :-) . Every once in a while I do a jamming with DJ thing through their system, but that's a different vibe. But my usual playlist is light jazz, some poppy/Stevie Wonder type things, a couple jam tracks, etc. I am not a jazz nutter, so I tend to play the tune, noodle a little, finish with the tune, all the time trying to sound good. Please note I no longer jump on tables and wiggle around in a sparkly thong doing Ibiza stuff. However once I played some Disney songs while they came in and walked down the aisle...and I played Baker Street as requested at a wake gathering. And once the girls did sing along to Delilah and Sweet Caroline...