Billie Holiday’s St. Louis Blues is good example of the stylization of AA'B in early jazz and blues music. I argue against AAB because the only similarity in the first two lines is lexical. The melody that she sings and the accompaniment of the brass stays along the lines of the first lyric, but there are still distinguishing differences that set the two apart. Which is what makes Blues so different from the parlor music and folk songs that came before. There is room for variation that is left to the singer and the musicians discretion. Improvisation makes the song sound different each time someone sings the same song. A similarity that we hear with this song and other blues pieces to other styles of music is the emotional change in the instruments to match the feelings of the what is being sung. Half way during a verse we can hear the lower sounding instruments taking the lead until we get to the last line, or the “punch line”, where the high pitch blasts of the trumpets take back control. Listening to what instrument is dominating the harmony lets you know what part of the verse we are listening to.