Alex Ebert, the flamboyant singer and songwriter for L.A. indie rock band Edward Sharpe and the Magnetic Zeros, has been tapped by director J.C. Chandor to score “All Is Lost.”The second feature from the “Margin Call” helmer, “All Is Lost” stars Robert Redford as a man lost at sea, and reps Ebert’s first ever scoring gig. “This is a truly unique work, having no dialogue, and has required a total reliance on the subtlest and most cloistered of instincts to guide each choice,” Ebert said. “All Is Lost” is being produced by Neal Dodson and Anna Gerb, with Lionsgate and Roadside Attractions releasing. Edward Sharpe and the Magnetic Zeros’ most recent full-length, “Here,” debuted at No. 5 on the album chart last spring.