Musical is a cinematic form, which emphasizes song routines in a significant way. They can be with a musical performance, which usually integrates as a part of film. Musical usually combines dance and music. There can be elements of choreography and song. The most popular subgenres are musical comedy, minstrel shows and burlesque. Most musicals before 1930 remained constructed amusements. In this period arose generation of lyricists, for example, composer George Gershwin and Cole Porter.