Four-beat belongs to the compound beat, each bar consists of 2 or more beats of the same type, it is characterized by strong and weak beats, in addition to sub-strong beats, pop music, jazz and rock music are mostly four-beat.
Four Little Swans refers to the Four Little Swan Dance, which introduces the Four Little Swan Dance, a dance piece from the second act of the four-act dance drama Swan Lake, which is one of the most popular dance pieces in the dance drama.The music of this dance piece is easy and lively, with a clean rhythm.