The instruments at the beginning of the song include a guitar, drums and trombones. These instruments are combined in such a way that it actually sounds like a train coming down the track. The thick texture of the instruments as they are laid one over another helps to develop the rich sound and tonal quality thereby improving the over all sound quality. The beat is kept in check by the smoothness of the upright bass along with the structured rhythm of the drums. The pulsating beat is somewhere between slow and fast. It provides a perfect rhythm to dance to as both a new dancer as well as an experienced one could find the beat easily. In fact, the lively, upbeat mood makes one want to hit the dance floor and dance-experienced or not. It is a happy song that makes the listener unconsciously start to tap his feet. The dynamics of the song seem to change around the 1:14 mark when the singing starts. The song, which is at its best as an instrumental, seems to loses some of its force and pizzazz with the vocals. The vocals serve the purpose of telling the story of the A train, but that is about all it does. The singing detracts from the richness of the horns and woodwinds. The trombones, trumpets, saxophones, and clarinets contribute to the vivid tonal color of the instrumental, but then the singing detracts from that. This is a song that I could listen to over and over again-but without the vocals. The dancing also took something away from the song, so I would not care to view the video ever again. It is the rich, jazzy element of all of those horns that draws me in and makes me want to listen to this song many more times.