A quartet of musicians with the whimsical name The Oak Street Tree-O plus 1 will perform a program entitled “Well-Known Masterpieces of the Baroque Era” at the Oasis of Music, Wednesday, Sept. 13, from 12:30 to 1 p.m, at Trinity Church, 247 Bates St., Lewiston. This quartet, whose members include Chris Lansley, flute, Candy Sykes, violin, Carol Oakes, cello and Stefanie Barley, piano, will play music by Bach, Handel, Mauret and Pachelbel. Admission is free.  FMI: call 344-3106.