Swing dance music is mainly jazz and big bands. But jazz isn't the only type of music, swing music can be Rock n Roll, Blues. To make it easier the music was like a 40's type of music. One of the best composer for big bands was Glenn Miller. Duke Ellington, Ella Fitzgerald, Louis Armstrong ( some of the music), the Andrew Sisters, etc. There is a bunch of music for swing it's just not common to hear it on the radio in the present day.