A duo is the format Adelaide's wedding and function trade has quietly settled on, and the reason is the venues. Cellar doors, stone barns and old sheds in the Barossa, McLaren Vale and the Hills have hard surfaces, no installed sound and often not much power, and two players with a small PA fit those rooms in a way a full band never quite does.
The other reason is that a duo can play the whole day. Acoustic through the ceremony, something warmer over canapes, then a fuller sound once dinner is done, all from one booking and one arrival. That saves you coordinating three suppliers and a lot of gear moving in and out of a working winery.
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Two players sits neatly between a solo act and a band, and the number moves on hours, the drive out to wine country and whether they supply sound or the venue has some. Booking the ceremony and the reception together is cheaper than treating them as two jobs. Look at the from-prices against each duo on this page, since they come from the acts themselves and shift with the season.
A second player changes the volume and the fullness more than the song list. A singer with a guitar can carry a ceremony and a quiet dinner; add a second instrument or a second voice and the same room suddenly has enough behind it to get people dancing. If your night has a dance floor in it, the duo is usually the smallest lineup that will fill it.
Constantly, and it is the format most South Australian wine venues prefer because of the space and the noise limits. Many cellar doors sit close to neighbouring properties and hold a finish time in their licence, so the duo needs to plan the night backwards from that. Ask them which venues in your region they have already played.
Most will take a short list in advance, and a handful of songs learned properly beats a long list half remembered. Send them the aisle song and your two or three must-plays at least a month out, then leave the rest of the night to them. If a song is outside their style entirely, a good duo will say so rather than take it on and hope.
A city duo heading to the Barossa or down to the Vale is an hour each way plus gear, and most will price that in. Two numbers that look close can separate once travel is added, so ask for the landed figure.
Stone walls and a concrete floor throw sound back at you, and a duo that plays those venues regularly will bring a smaller rig and set it lower. If your venue is a barn or a cellar, say so and ask what they do about it.
Fringe and Festival season books out a large share of the city's working musicians for several weeks, and the ones still free are stretched thin. A March booking wants more notice than the same event in August.