Edited for obvious coherence flaws at the time of writing:
Hmmn, well to tell you the truth.. I'd been thinking about structure a long time before I ever made a song..
But the way I like to do it is, approach it with a loose idea of where its gonna go, (ie: big journey building up, doof song becoming something else etc) then edit it over a few months into something like what I imagined in the first place..
It's weird you say that, because production took me 2 years to learn, and structure was always natural for me, I've got 100 tracks finished in terms of structure, and each one is different, I think in reference to a song structure, don't look for rules or a system of guidelines..
Simply think about dynamics, if that bit feels repetetive, make the next bit a tad crazy, if that bits a bit too overbearing, bring down the next part, eventually you realise you end up with a whole song structure.. I admit usually I have the layout loosely in my head before I even start, a certain build up or something, so I tend to just.. go with my gut feeling.. if you get me?
Sometimes I do it a different way having it exactly planned from the start, and cutting and chopping it (with a program like sound forge) until it fits the dynamics I've planned it to do.
The greatest bit of advice is this though, try to never repeat yourself, if you've done a structure once, try to reach the same buildup, in a different way, and you'll find there are infinate variations to the dynamics of a song.
However for me, once I got to 100 tracks, on 7 different projects, I'd used up every structure I could come up with, but I don't really need any more, I'll just release these over the next few years..
[email protected] if you wanna trade tunes, or if you want me to clarify the slop I wrote above
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All hail the new flesh, cause it suits me fine!