A trio is the point where live music stops sounding like two people helping each other out and starts sounding like a band. The third player is usually what fills the middle: a bass under the guitar, a percussionist giving the set a pulse, or a second voice for harmony. For most Perth function rooms that is the right amount of sound.
It also suits a city this far from everywhere. Nobody is flying a band across the Nullarbor for a Saturday, so what you book here is local, and the trios below are mostly made of players who work together often rather than a group assembled for the night. That shows up in how tight the set is.
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Three musicians is the base of the figure and the rest is hours, gear and driving, so the list below is worth reading with those in mind. A trio for cocktails and dinner in the city carries less equipment than the same three doing a full dance set at a Swan Valley property, and the second one finishes much later. Ask each act to quote the block of hours you actually need rather than their standard package.
For the dancing part, generally yes, because the third player gives the set the bottom end and the drive that gets people up. For the ceremony and the canapes it makes very little difference and you are paying for a player who is barely stretched. Quite a few Perth trios will do the early part of the day as a duo and add the third for the reception, which is the arrangement worth asking about.
Swan Valley, the hills and down to Mandurah are all ordinary jobs. Once you are talking about the South West or up the coast, you are covering fuel for two or three vehicles plus somewhere for three people to sleep, and that changes the shape of the booking entirely. Put the venue in your enquiry so the travel is quoted rather than negotiated afterwards.
The pool of working groups here is not large, so good ones go early for the busy stretch from October through to March. If your date is a Saturday in that window, start three or four months out and expect your first choice to be gone if you leave it late. Midweek corporate work and the cooler months are much easier and you can often book within a few weeks.
Guitar, bass and vocals is a different night from keys, sax and vocals. The instrument list tells you what the music will feel like far better than a genre does.
Some trios are a fixed band, others are a soloist who calls in two players for the date. Both can be excellent, but the first needs no rehearsal fee and the second sometimes does.
Three players with amps and a PA need somewhere to unload. Many Perth venues have a side gate or a service lane that saves half an hour, and nobody will find it unless you say.