Hamilton is not a musical. At least, not as I understood the term up until Friday night when I sat down on the first mezzanine of the Richard Rogers Theater to see the much-lauded show. My original definition of a musical was a play with plainly spoken dialogue punctuated by occasional outbreaks into song. Watching Hamilton, it took a couple of back-to-back musical numbers for me to realize that the kind of dialogue I was expecting would never come. Nearly every line in the show is either rapped or sung. The music almost never stops. Technically, Hamilton is a sung-through musical, like Les Misérables, which can also be called pop or rock operas. In Hamilton’s case, however, the term hip-hop opera would be the most fitting description.