"Let's Go Away for Awhile" and "You Still Believe in Me"

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I just listened to some of the recordings I made for this project.  The last two I did were the bass parts for "Let's Go Away for Awhile" and "You Still Believe in Me," and - even listening to the first few measures - I thought they sounded slightly similar.  So I played around with my recording software, and after plotting some MIDI notes, I confirmed that they have the same rhythm (for some sections, at least):

(That notation is meant to indicate only the rhythm; the pitch isn't relevant.)

Almost from the very beginning of this project, I've been wondering if there are certain musical elements that tie the Pet Sounds songs together.  I'd actually been thinking more about tonality, but rhythms certainly apply too.