Tanglewood’s obvious attempt to attract a somewhat younger crowd continues. The Boston Symphony Orchestra’s summer home announced a few new shows Monday, including Joan Baez (above) and the Indigo Girls, who’ll perform in the shed June 23; Barenaked Ladies, Ben Folds Five, and Guster July 23; and Grace Potter and the Nocturnals with Josh Ritter Aug. 19. Previously announced concerts include Melissa Etheridge with Eric Hutchinson (6/21); Jerry Garcia Symphonic Celebration featuring Warren Haynes and the Pops (6/22); Jackson Browne and Sara Watkins (7/4); Esperanza Spalding (8/4); and the Steve Miller Band (7/29). … Harvard biologist and two-time Pulitzer winner E.O. Wilson is writing again. Wilson, author of “The Social Conquest of Earth,” has sold his new book, “A Window on Eternity,” to Simon & Schuster, says his Boston-based literary agent, Ike Williams. We’re told it’s about a park in Mozambique that could transform our thinking about preserving biodiversity.