Musical structure
The 30-second version of "Think!" has a tempo of 132 beats per minute, so that exactly thirty seconds elapse between the start of the first note and the start of the last two timpani hits at the end.[citation needed]
The 1984 "main theme" recording of "Think!" is set at the same tempo. The introduction begins in B major and then transposes a semitone upward to C major. The main melody is first performed in F major, then continues in a circle of minor thirds: upward to A-flat major and B major, downward to D major, with the F major and A-flat major portions repeated after that.[3]
In the 1997 arrangement, the tempo is at about 120 beats per minute. The introduction begins in D major, then up a perfect fourth to G major, followed by the brass playing the notes D, a major second down to C, a perfect fourth up to F, a major second up to G, and a perfect fourth up to C, and the main melodies begin in F-major, and so forth. The F-major, A-flat major, and B-major sections are repeated.
The 2001 arrangement had a structure similar to the 1997 one, except the tempo was at 136 beats per minute. And there were two versions with different introductions. In one version, the introduction is similar to the 1997 arrangement except it starts in C-major, then transposes up a minor third to E-flat major, then up a whole step to F-major, another whole step up to G-major, then the five notes leading into the main melodies. In the other version, the introduction began in A-flat major, transposed up a minor third to B major, followed the same five notes. Also, in both versions, there's a middle section in F major, then briefly moves a minor third down to D-minor, then to A-flat major, and back to F-major, and the main melodies repeat.
The 2008 arrangement, at 132 beats per minute, starts in C-major, then moves up a minor third to E-flat major, and stays there while saxophones and electric guitars improvise, then repeats the C-major and E-flat main melodies, stays in E-flat while saxophones and guitars improvise again. The main melodies return, and the piece ends in E-flat.