Isn't there a saying about music calming the savage beast? If so, it seems quite apropos for a fifth grade teacher to also be a musician.Murdock teaches at the Friends Academy in Dartmouth by day, but by night, weekends and during summer vacations he's a Berklee College of Music-educated singer/songwriter recording and playing gigs at many different venues. A self-described folkie, he writes songs that are folk-inspired, yet also have a bit of blues woven in.