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How to film Roddy Doyle's comic and affecting novel about a Dublin band trying to bring soul music to Ireland? Audition 3000 musicians and pick the top twelve to play the Commitments. It's the old Monkees trick: If you can't find a band, manufacture one. British director Alan Parker (Fame, Mississippi Burning) lucks out. The dozen unknowns he's chosen -- ten with no previous acting credits -- make a joyful noise and rousing company. Parker, however, hasn't made much of a…