[link to original on tumblr]
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After the first part of the solo (the part that's mostly arpeggios doubled on electric piano and organ), the guitar rhythm (starting at about 2:06) has exponentially diminishing note values, the same feature that's also in the bass part of the alternate version of the Zombies' "I Want You Back Again" and the version of "Just a Little Bit" that they performed on The Beat Show in November 1965. (I wrote about this in two posts last year.)
Here's my hand-written notation for the bass part of the alternate version of "I Want You Back Again":
Here's the notation I made for the bass part in the live version of "Just a Little Bit":
And here's the rhythm of the guitar chords in the second half of the solo in "Pleasure." They're E major chords, but I'm not sure of the exact phrasing (I think it's the standard E B E G# B E, but I don't think every note in that fingering is played), so I just notated E notes.
The note values are both larger and shorter here, starting with four measures of tied whole notes (sixteen beats) and ending with sixteenth notes, but it's the same feature.
Like I've mentioned before, Rod Argent and Chris White shared the writing credits during this period although they continued to write separately. Because this feature is present in both "I Want You Back Again" and "Pleasure" and because "I Want You Back Again" was written by Argent, it seems to suggest that he wrote "Pleasure" too.
Back in January 2015, I discovered that a phrase in the bass register of the piano part at the beginning of "Pleasure" (B C# D# E F# G#) is also in the Argent-written "Hung up on a Dream," a similarity that also seems to suggest that he wrote "Pleasure."