[link to original on tumblr]
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I'd never really paid attention to it before, but the part during the organ solo is really interesting. As it goes on, the note values become progressively shorter. First, they're whole notes, then half notes, then quarter notes, and then finally eighth notes:
I'm not familiar with any other version of the song, so I don't know if that's a feature specific to the song or something that the Zombies came up with.