Formerly known as the WPI Baker's Dozen, Simple Harmonic Motion changed its name in 1994 when it became student-directed. The group, whose repertoire ranges from the pop music of the '50s and '60s to modern a cappella and rock, recently released its first CD Sing 'till it Hertz. The CD is available at Tatnuck Bookseller @ WPI and at Tatnuck Bookseller Marketplace, 335 Chandler St., Worcester.
On Saturday, Nov. 23, beginning at 1 pm, SHM and Valerie and Walter Crockett will present an afternoon of musical entertainment at the marketplace. The Crocketts will perform songs from their new CD Unbutton Your Heart.