IT’S 10 A.M. ON A SATURDAY at Club Passim, the storied Harvard Square folk venue frequented by Joan Baez and Bob Dylan in the 1960s, and the place is packed. Strollers neatly line the walls of the club’s tight foyer, and the small tables inside are already littered with Starbucks cups, sippy cups, and baggies of Cheerios. Adult chitchat mingles with a — mostly — cheerful din of toddler noises.
In a tiny brick-walled back room, Alastair Moock, dressed in jeans, a blue checked shirt, and a newsboy cap, is seated on a stiff-looking chair. It’s a big day for Moock — it’s his 10th family show here, and he’ll be debuting songs from his new album, Singing Our Way Through: Songs for the World’s Bravest Kids. In the audience are his 6-year-old twin daughters, one of whom, Clio, is the inspiration for the album. Clio is undergoing treatments for leukemia; a pink headband adorns her bald head.