At least a half-dozen movies are struggling to get out of the ambitious but maddening hodgepodge that is writer-producer-director Spike Lee's Mo' Better Blues. At the center is a romantic triangle: Bleek Gilliam, the Brooklyn-born jazz trumpeter played by Denzel Washington, is juggling two women -- Indigo Downes, a dedicated schoolteacher played by Joie Lee (Spike's sister), and Clarke Bentancourt, an aspiring singer and sexual bombshell played by newcomer Cynda Williams. The women don't like…