What makes 'In the Heights' so unique, however, is that despite the driving pulse of its Latin-American rhythms, blending hip-hop, rap, jazz, pop, salsa and merengue, this buoyant musical also nods reverently to the traditions of the show tune. From its catchy opening number, which tosses in references to Cole Porter and Billy Strayhorn while swiftly introducing a large gallery of key characters and placing them within a vividly drawn community, the musical's plucky marriage of youthful freshness and lovingly old-fashioned craft is hard to resist.