It's just past the 20-year anniversary of _Altered States_, author Matthew Collin's era-defining book on acid house and rave culture in Britain. Collin is back with a brand new one: _Rave On: Global Adventures in Electronic Dance Music_ ponders how electronic dance music — once the utopian frontier of underground pop culture — is surviving its transition into the global mainstream. RBMA correspondent and Choice Mix host Lauren Martin sits down with Collin in London to discover more about his travels to the big-room clubs of Ibiza, Las Vegas and Dubai; his explorations into the techno idealism of Detroit and Berlin; and embedding with DIY party people in South Africa and New York City. Also on today's show, we premiere a hypnotic new techno track from Antwerp-born Locked Groove, plus plenty of new music.