The Solomon Douglas Trio consists of piano, acoustic bass, and drums, and often includes vocals (from the pianist).
Unless you make special arrangements with me, I will need you to provide an acoustic piano (grand or upright, tuned) or a suitable digital keyboard with 88 weighted notes (such as any one of the following: Roland fp-3, fp-5, fp-8, fp-9, RD-150, RD-500, RD-600, RD-700, a-90; Yamaha P-60, P-80, P-90, P-120, P-150, P-200; Kawai ES-X; Korg SP100; Kurzweil sp88x; Casio Privia PX-300, PX-310).
In addition to the amplification main speakers, your PA system will need to include three microphones (with cables and stands) if the piano is acoustic, or one microphone (with cable and stand) plus two quarter-inch inputs for the piano if the piano is digital. You’ll also need to provide one monitor wedge.
In most performance spaces, the drums do not need to be mic’d. The bassist can usually run a line (XLR) directly into your mixing board.