R&B/pop phenom Pharrell Williams is best known for his worldwide smash hit “Happy.” Earlier in his career, he released “Number One,” featuring a somewhat more sane version of Kanye West. The 2006 tune features a lot of descending chromatic bass motion — rather unusual. The intro (through 0:17) is based on a 4-chord vamp built around F# major, but the first verse (0:17 – 0:53) drops down into an F major/E minor vamp (the F major serving as a “sub V” for E minor.) The chorus, starting at 0:53, reverts to the same setup as the intro; subsequent verses and choruses follow suit.
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