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What determines whether vocalist Phil Minton is Europe’s greatest living improvisational singer or an undiagnosed schizophrenic with digestive problems may be in the ear of the listener. But the 58-year-old English singer (and sometime trumpeter) has fashioned a career out of taking his voice into realms usually visited only by the most touched among us. Using words, found sounds, and a huge tonal and timbral range, Minton’s powerful voice taps into a primal spot that takes some patience to explore. The Phil Minton Quartet, including saxophonist John Butcher, pianist Veryan Weston, and drummer Roger Turner, interrogates the texts of another man known for his use of invented words and sounds when it performs fully improvised music set to the words of James Joyce’s Finnegan’s Wake at 8 p.m. at George Washington University’s Phillips Hall, Room B120, 801 22nd St. NW. $10. (202) 994-6245. (Christopher Porter)