As a jazz musician who strives to connect with the audience, I've always found the ''head-solo-solo...-head'' structure somewhat problematic to the common ear.
The audience only get to hear the head once as a semi-intro, then they're forced to move on to the excruciatingly long solos; when the head finally returns, it's only functioning as a semi-outro (that the players don't take seriously at this point). So here's the problem: first of all, just stating the theme once isn't even remotely going to get the human brain to ''soak it up''; that means the audience isn't psychologically ready to hear all the solos after just one head. Secondly, placing the head at the beginning and the end not just reduces its own importance (as they've become semi-intros/outros), but it also reduces the solos as well due to lack of sufficient contrast.
But when I started to study rap music, the most important thing that I figured out was that rap works a lot like jazz--there's a theme and everyone takes a solo around it--yet the difference is that in rap, the hook (the equivalent of a jazz head) is sandwiched between every single verse (the equivalent of a jazz solo).
This creates a whole lot more ''layers'' to a rap performance than a typical jazz one. It's not just you can give the audience a clearer sense of what this song is about, the ''element of surprise'' can be utilized even better just by constantly switching between theme and variation, group and solo, etc.
Now imagine a rap song who's hook only appears at the beginning and the end, with 6-minute-long verses in between. How dull would that be? Unfortunately, that's what most jazz performances have been and are like.
(No wonder people say that ''don't understand jazz''--well you can't understand a genre if you can't even understand a given song. The truth is, most humans are song-based instead of genre-based; that is, as long as they love a song, they'll love the genre that the song belongs to. )
In short, I'm thinking of adopting the rap structure in jazz performances so that it goes ''head-solo-head-solo-head-solo...-head'' instead of ''head-solo-solo-solo...-head''. This sounds heretic, yes, but don't get me wrong: jazz is really all about improvisation and freedom, so that's exactly why it'll work even better if there's more stability and predictability serving as a contrast.
Last but not least, Chick Corea's Spain roughly follows the same sense (with a memorable ''hook'' between every solo), which is exactly why it's so memorable. I'm surprised that this method hasn't been more widely adopted.
I believe this is crucial to the future of jazz and I look forward to your opinion.
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