In recent years, the London d.j. and multi-instrumentalist Fred again.. has quickly become one of the most buzzed-about stars in electronic music. The youngest artist to win Producer of the Year at the Brit Awards, he has steadily evolved from Boiler Room darling and producer for such artists as Ed Sheeran, BTS, Ellie Goulding, and Stormzy to solo artist in his own right. His long-running “USB” compilation, an ever-growing album of tracks he’s been adding to since 2022, feels like a microcosm of this growth: collaborations with cult electronic figures and touted rappers build out an arc of the rare M.P.C. wizard so charismatic he can’t be relegated to behind the boards.—Sheldon Pearce (East End Studios; Jan. 16-31.)Off Broadway