There was some discussion particularly about California Girls. And I think c-man really hit one aspect on the head, in terms of the lyrics fitting the feel of the song. I don't know the writing situation, but assume that the first time Mike would have heard the song is with the completed backing track, as the song was referred to as "I'm a Power Mower and You're the Lawn" (paraphrased) during the recording sessions. GhostyTMRS says that Brian originally had a lyric of "I dig the girls" for the track, which if true is really key. Brian is multi-faceted, as we all are. Part of him is a jock, a guy's guy so to speak. I can easily see him loving the idea (though not necessarily the execution, as I'll touch on below) of the lyrics. This is particularly true in light of some other discussion in the thread, on the idea of the juxtaposition of high and low art, i.e. an immaculate backing track paired with juvenile/sexist tinged lyrics. Juxtaposition, playing opposites off each other, is a huge part of art, and I'm sure this wasn't lost on Brian, whether with intent or just based on instinct.
So picture yourself as Mike, sitting down with Brian. He has a song he's really excited to play; he puts the acetate on the turntable and out comes this beautiful baroque introduction, which transitions into an incredible, bouncy, upbeat track. What happens now? Is the melody already written? Are they coming up with it right then? The reason I ask is because I think the melody plays a part in the basis of the lyrics. This relates to another point discussed in the thread, which is that the subject matter of the song itself is not a problem, but rather the specific lyrics used. They are pretty clunky when you really look at them (but then again, how many lyrics aren't when you look at them in isolation?). Mr. Tiger, you described this idea well, and with some humor:
I don't think anyone's saying there should be introspective lyrics tied to "California Girls". The theme could have been the same, but far better refined and polished. There's no spark, no wit, nothing clever, just a leering slobbering kind of "Well, look at that chick over there, now let's look at this chick over here," approach that doesn't live up to the musical side of the equation. Maybe after a couple of drafts and some honing, Mike's concept might have worked, but it sounds tossed off when at the same time the musical backdrop is nothing but...
There is at least some truth in this for me, on the surface level. The vocabulary used is juvenile ("hip", "dig"). There isn't a poetic flow. The lyrics are utilitarian: they're simple, easy to remember, and get the point across. That is their strength AND their weakness. It's why millions of people love the song, and why a small subset of those millions take some level of umbrage with it (me included I guess I could say, based on the evidence). Why couldn't the song have had more mature lyrics AND been a hit as well, as compared elsewhere in the thread to the (incredible) Beatles track "Help!"?
I think part of the answer goes back to what I mentioned above in terms of the relationship between the melody and the lyrics. The melody of "California Girls" influences the lyrics in its bouncy feel and the way it scans. The feel of the melody builds on the jovial nature of the backing track- it jumps all over the place (it barely ever repeats a note 2 times in a row, particularly in the 1st verse), and has a lot of syncopation (i.e. singing notes on the rhythms between beats, rather than on beats), which gives it that happy feel. The other notable aspect is the way the lyric scans, basically meaning its rhythm and the way it flows. The rhythm is a bit unique since it has somewhat of a staccato feel (i.e. the notes are short, and thus the words don't flow together, like there's a slight choppiness: "Well East...coast...girls..."). This staccato feel of the melody, in combination with it having a swing/triplet rhythm, gives it a jazzy tinge. Musically this rhythm feels great...
...but (and now I'm finally getting to why I questioned how the melody was created), the rhythm of the melody guides, but also limits, what the lyrics are capable of. Going back to the comparison to "Help!", think about the lyrics and the rhythm/flow of the melody in that song. They're rapid-fire, Lennon is spitting them out. He's chaotic and he needs to get this off his chest. The rhythm of the melody allows the lyric to do this with its machine-gun pace. Now think about the notes of the melody. They're at the opposite end of the spectrum from "California Girls"; aside from the intro/tag, which jumps around a bit, the rest of the song features very little melodic movement. The 1st verse has a whopping 10 syllables all on the same pitch: "When I was young-er so much young-er than". It's almost more of a rap than a melody in this way. As with "California Girls", the melodic rhythm of "Help!" not only guides the lyrics, but outright influences them. The rhythm of "Help!" is written in phrases, and means that the lyrics necessarily must form more complete thoughts.
When we compare the rhythm of "Help!"'s melody to that of "California Girls", we can see that the slower, choppy rhythm of "CG" means that the lyrics can't use the more stream-of-consciousness type of approach used in "H". The lyrics necessarily have to be more simplified in order to mesh with the melody. So again, who wrote the melody? If Brian did, or they worked on it together, then Mike wouldn't have been in control of this important aspect of the melodic/lyrical connection. And if Mike did write the melody, then he was still bound to the already completed backing track in all of its buoyant glory. And in this case he would have been writing a melody to someone else's chords and feel, which is a different mental process than writing a melody to your own track.
So yeah, I do wish that Brian had worked with people other than Mike on more of his songs. I wish that he had been able to produce music on his own terms throughout his whole life. But given how things were, I think Mike may have been viewed overly harshly at times in this thread.
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Edited to add, I only wrote the above after reading the first 3 pages of the thread. Meaning that I did not read your analysis, guitarfool, of "California Girls" at the top of page 4, and the miniature reappraisal of the song that followed. Which is a bit serendipitous, as you touch on some of the exact things that I did, and probably a little more coherently. Great post.