Three schools and an art gallery have formed a new alliance called the Center for Arts and Learning in Montpelier, or CALM. With that reassuring acronym, the River Rock School, Monteverdi Music School, Summit School of Traditional Music and Culture and T.W. Wood Gallery will turn 46 Barre Street into an arts center for Vermont's capital city. The new consortium is buying the former quarters of the St. Michael's School and convent from the Catholic Diocese with the help of realtors and philanthropists Peggy and Paul Irons of Berlin. CALM plans to raise money for renovations to enhance the space that's already being used for lessons in voice and piano and other instruments, music composition and dance, as well as private classrooms for kids ages 5 to 14. "It's exciting — there's lots of momentum," says Steve Falbel, a Monteverdi board member and spokesman for CALM.