This summer's World Music Series got off to a spirited start last month with a packed performance by Colombia's Bomba Estéreo at Armstrong Hall. The second installment will feature the tropical sounds of Ocote Soul Sounds, the new group from Antibalas founder Martín Perna. (Antibalas, as reported in our festival cover story last month, is the house band for the Fela! musical that's been racking up Tony nominations on Broadway.) The free performance starts at 7 p.m. — Bill Forman