1977 saw a bouncy, harmonically restless pop hit by British band 10cc, “The Things We Do for Love.” The instrumental intro starts in key A; verse 1 modulates at 0:19 into Key B; another key change at the intro to verse 2 reverts back to Key A (1:15); another at the bridge (which could also be heard as an instrumental verse) into key B at 1:38; back to Key A at 2:16; and finally back to key B at 2:34.
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