Mas Que Nada

Ninety-four chords, in a ratio that catches the eye: forty-six minors and forty-six dominants, almost always alternating in pairs within the same bar.

When a minor and a dominant share a bar there's a decision to make — two scales or one. It comes up dozens of times here, and it's the most frequent decision in the tune. Six tonal centres, and the groove hides all of it from a casual listener.