It's amazing how things in 'life' differ as much as the locations in which we live ... based on my conversations with musicians around the RI area, a GOOD OMB will make anywhere from $500 to $1200 for a wedding or other good sized party, depending on what he/she does as a performance ... if they are doing DJ work as well as keys/vocals the price goes up to the $1200 range, even higher ... include lights, whatever and the price goes even higher, as in Donny's post ... some guys do 'specialty' shows, such as Sinatra, Dean Martin, Michael Buble, along with DJing and make even more ...
IN the greater NY area, bands are still in demand for weddings and big dances, but these are 8 - 10 piece groups of well schooled musicians and vocalists, who can play and sing ANYTHING and sound like the recording ... AND they will command $10,000 + for a wedding ... I would say most DJs in the NY area perform - sing/ play instruments - as well and also command top pay ... but then, we are talking the greater NY area where there is a LOT of work if you are GOOD ...

Back to the OT ... I used to play almost ALL Christmas music at this time of year, but the past two years I've gotten away from that ... now I keep it at about 1 out of 3 songs and the rest is the 'other' music the audience likes to listen to ...