Sounds Around Town: Jam And Jump For Joy With Jeff

Jeff Jam pronounces his name as one word: "Jeffjam," with an accent on the first syllable. During a recent phone conversation, the singer-guitarist was happy to say that he’s 48 years old, his main audience is kids up to the age of 6, he grew up in Groton, he’s married and has lived in Somerville for the past 19 years, and he’s released five CDs of originals and cover tunes for kids.