A new month means a new series of Zooming with Matt, Medford musician Matt Heaton's early childhood music classes for those age 0 to 5 and their guardians. Centered on movement, social and empathic development, and early math and language games, these small sessions are designed for adults to participate with kids. Join Matt as he sings, dances, plays with scarves, and shares jokes. Classes run in four-week sessions on Mondays (April 5, 12, 19 and 26) at 10 a.m.…