It's 3 piece band setup, with any combination. Sometimes with a vocalist, sometimes just an instrumental trio.
It has very unique dynamic as a guitarist in this setup. With a bassist & vocalist in the group, I'll just play chords & necessery melody. With a vocalist but without the bassist I'll play the bass line & chords.
With a drummer, usually I'll be on bass.
Photo "with Juliet Pang on vocal & Didi Mudigdo on bass"' courtesy: Malvin Foo (Ticket Mash).