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By Joan Anderman, Globe Staff  |  March 27, 2005 He signed Keane. But record executive Martin Kierszenbaum never stops listening, especially at rock's most important showcase. AUSTIN, Texas -- It's 8 o'clock on Friday night at the South By Southwest Music Conference, and the bouncer at the door of Buffalo Billiards is about to push mild-mannered Martin Kierszenbaum into the street. The giant ye…