Vaanavil Vaazhkai opens with a song—it’s intended as a musical, after all—and the very first image we see is a group of girls dancing suggestively to the music. It's quite an odd way to begin! This marks the directorial debut of TV personality and music director James Vasanthan, and he deserves some credit for attempting a full-fledged musical. However, that’s about all the positive things I can say. As a movie, it r…