My current band is a four piece: Drums, Bass, Guitar, Keys/vocals. The Drummer is obviously in back center, and the vocalist/keyboardist is in the front center. The good thing about the guitarist in this band is that he's left handed. We usually arrange ourselves so that our necks are facing in. This is good for small stages. Also, it puts me to the stage-right of the drummer, which I prefer. Being stage-right, and right handed, it's a little easier for me to face the rest of my band, particularly the drummer.