The band plays a steady, swinging rhythm in the background. The only time the instruments increase in volume or intensity is when Fitzgerald's own singing gains intensity. The music seems to move with her, instead of her moving with the rhythm of the music. At the beginning of the song, the brass plays an introductory note before each phrase of his scat. When she begins to sing, the first instrument the listener can clearly hear come in is the hi-hat, tapped to the classic swing jazz rhythm. The trumpet also enters at this time. Around 1:13, Fitzgerald's next scat solo is introduced by a short brass cadenza from the band.22 Throughout the song, one thing the listener should notice is that there is a parallelism between the melody being played by the band and Fitzgerald's scat. This parallel takes place at 2:45, when the band also increases in