Topic 1: There is an introductory section to this song, which occurs in the first 10 seconds of the recording. The "tune" or the beginning of the 12-bar blues form does not begin until 00:10. How many choruses of the 12-bar form does Johnson perform on this recording? How does the guitar accompaniment help support the 12-bar form? Are there similarities in his guitar accompaniment from one chorus to the next?