The Black Key’s Tighten Up, like most of their songs, is a very straight forward blues rock song. But there are a couple of oddities. The first is a rogue bar of 3/4 in bar 38.
The second starts at bar 48 when the song, ironically, loosens up and the tempo slows. I think you could switch the 3/4 bar to 4/4 and no one would notice. But the tempo change feels integral to the song.
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