Three players is the size most Melbourne function rooms actually want. You get harmony, a bassline and something rhythmic to dance to, and the whole thing still fits in a corner of a Fitzroy warehouse or a small city rooftop without eating the floor space. Watch a couple of videos below and you will hear how much fuller a trio sounds than the two-piece you were probably comparing it to.
The shape varies more than the name suggests. A guitar, bass and cajon trio doing acoustic covers is a different booking from a piano, double bass and voice trio playing standards through a dinner, and both sit under the same heading. Work out which sound you are after before you send the first message, because it changes who is worth asking.
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For up to a couple of hundred guests in a normal function room, yes, and with the right PA a trio carries a dance floor perfectly well. Where it gets stretched is a high-ceilinged warehouse or a marquee on a Macedon Ranges property, where sound disappears upward and outward. Tell the trio the room and they'll either bring more PA or tell you honestly that you want a bigger band.
The third player is nearly always what gives you a dance floor. A duo can hold a room beautifully through canapes and dinner, but three musicians means someone can hold down rhythm while another takes a lead, and the songs stop sounding like arrangements and start sounding like records. If nobody is dancing at your event, the duo is the smarter spend.
Commonly they do, and booking both together is cheaper and far easier to coordinate than two separate acts. In Melbourne the wrinkle is weather: if your ceremony is on a lawn in the Dandenongs and the reception is indoors, ask what the wet-weather plan does to the setup time. Ask for one combined price rather than adding the two halves yourself.
Power near where they're playing, somewhere to park within a reasonable carry and a meal if they're on site for more than a few hours. Melbourne trios working the inner suburbs will ask about parking first, because a permit zone outside a Carlton terrace is a real problem at 5pm on a Saturday. Everything else they bring.
Three musicians plus stands and a small PA want roughly the footprint of a dining table. Heritage rooms around the CBD often have less spare floor than the photos suggest, so send the band a picture of the space.
Some trios carry a dedicated vocalist and some share the singing between the players. If you want a strong lead voice for a first dance, ask which of the three is actually doing it.
A trio heading to the Yarra Valley or down the Mornington Peninsula is three cars and a late drive home. Get the travel in the written quote rather than discovering it after you have chosen.