It seems shortsighted to begrudge the rain in a year following such a serious drought, but if the rain had to fall so infrequently, why did it always seem to pour on the Rhythm Foundation's outdoor summer concerts? Colombia's vallenato king, accordionist Alvaro Meza, was completely washed out of the 73rd Street bandshell and showers kept crowds away from a cardiac arrest-inducing performance by Congolese soukous star Diblo Dibala. And the elements had nothing to do with the terrible events of September 11, the global reverberations of which kept Senegal's superhero Youssou N'Dour not just off the stage at Level but away from our shores. Yet all was glory on the cloudless night when saxophonist Paulo Moura performed the old-time Brazilian ballroom music gafieira beneath the stars. And when the Rhythm Foundation teamed up with the Miami Light Project to bring Los Mu?equitos de Matanzas to Miami for the first time in the Cuban folkloric institution's 50-year career, there was no greater pleasure to be found in this world or any other. Which just goes to show that the Rhythm Foundation can do more in a couple of shows than most presenters can manage in a full season.