Notating the bass part in the introduction to "I Want Her She Wants Me" is still beyond me, but the first few phrases fit nicely in 3/4 (the majority of the song is in 4/4, though):
where the first G in each measure is a hammer-on.
In "Summertime," there are some very similar phrases, first occurring at ~0:23, under the "high" of "and the cotton is high":
where the first E in each measure is a hammer-on.
The interval between the two pitches in "I Want Her She Wants Me" is a half-step, and the interval between the two pitches in "Summertime" is a whole step, but otherwise, these figures are the same. In both songs, the figure also occurs three times in succession.
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This similarity between the bass parts reminded me of a similarity between the backing vocals that I noted years ago. I revisited the parts and improved my accuracy, but I'm still not sure I have everything note-perfect.
The backing vocal in "Summertime" is something like:
It's a bit different the second time. Instead of just E F# in the last line, the E F# G# F# figure is repeated.
The backing vocals in "I Want Her She Wants Me" are something like:
Common to both is the sequence E F# G(#) F# in fairly even note values.
