A dance band is judged on one thing, and it is not musicianship. It is whether the floor stays full between about nine and midnight. Plenty of technically excellent Brisbane groups play a lovely set to a room of seated people, and plenty of rougher bands can read a crowd and change direction the moment a song is not landing.
Which is why the footage matters more here than in any other trade. Skip the studio clips and find the one shot from the back of a real function room. If you can see people dancing who are clearly not in the bridal party, you have learned something no description will tell you.
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The song choice and the running order, mostly. A cover band plays a good set of recognisable songs from the start of the night, while a dance band builds the evening deliberately towards a full floor and keeps it there. Plenty of Brisbane groups do both jobs, so ask how they would structure your particular night.
Around sixty guests is where a band starts to beat a DJ for atmosphere, because you need a critical mass of people willing to get up. Below about forty, a smaller lineup or a DJ usually fills the floor better. Tell the band your headcount and they will tell you honestly if you are better off with fewer players.
More than most people allow for. A drum kit alone takes a couple of metres square, and then there are amps, keyboards, monitors and room for people to move. Ask the band for their stage dimensions and check them against the venue plan rather than eyeballing the room.
Usually yes if you ask early, because it is rehearsal time for everyone in the group rather than one person. Give them the song and the version you mean at booking, not a fortnight out. If it is very obscure, some bands will suggest playing the recording and starting live at the chorus, which works better than it sounds.
A dance space stuck behind a pillar or on the far side of the tables stays empty no matter who is playing. Put the band where the room can see them and leave the floor between them and the guests.
A band that stops dead for twenty minutes hands you a flat room at exactly the wrong moment. Most run a playlist through their own system between sets, and it should be in the quote rather than an afterthought.
Brisbane hotel ballrooms and riverside function spaces frequently cap volume, and a horn section with drums can hit that ceiling. Get the venue's number and pass it to the band before you book a large lineup.