London septet the Orchestra (For Now) are the latest breakout stars of the city’s vaunted Windmill scene, the community orbiting the Brixton venue the Windmill, which has nurtured arty and ambitious indie rock bands like Black Midi, Squid, Shame, and Black Country, New Road. On Halloween, they’ll release their Plan 76 EP. They introduced it with the loud and jarring “Hattrick.” The second single is different.