I like John Leguizamo (Executive Decision, Moulin Rouge!,Land of the Dead), and he is really believable in this film. He seems to really take on the character of a young Mexican immigrant who just wants to play music.
Elizabeth Pena (Lone Star, Rush Hour, Transamerica) was also very good as the singer who no longer believes in herself. Pena and Leguizamo support each other to the top.
Having said that, this was more of a music video than a movie. Sure, there was the attraction between Leguizamo and Ana Claudia Talancón, and the fantasy dance they did was so hot I wanted a cigarette after watching it, but it was just a minor part of the film, which was 95% music.
Nestor Serrano (Girls in Prison, City by the Sea) was also very good as the band's manager. And, I sure want to see more of Erica Munoz.