I wonder how many people approach their musical projects with a clear idea in their heads of what the end result is going to be, and how many people - like me - start off with a tiny seed of an idea which is then thrashed around and twisted and warped and revised and ditched and reinvented many times over before finally resulting in a finished tune which is maybe 1% similar to how it started.
Seriously, I cannot work any other way. Sometimes it worries me, but most of the time I love it. It's just so much fun.
Take the tune I'm working on now. It started off as a kind of homage to 80's/90's video game music. Then because of a wild distorted synth guitar sound I came across, it changed course and took the form of an 80's action movie soundtrack with lots of feedback. It wasn't long before the mix became a little dense and problematic, and so I started cutting things out of it and mellowing it out. The overdriven synth lines became clean and staccato (think "Popcorn") with a nice rhythmic delay, and the somewhat muddy, sustained synth chords were put through a step sequencer linked to a volume pedal to give them a fast, staccato rhythm, and my recent acquisition of the 70's/80's Vintage expansion pack for Z3TA saw the bassline taking on shorter, squelchier notes instead of a sustained rock style bass. At this point it's sounding like some real retro early 80's electro-funk/vintage hip hop (think Grandmaster Flash).
This is how I almost never finish tunes to my complete satisfaction. But who cares? I love it. No doubt by this time next week it will sound a lot different. To tell you the truth I'm a little envious of people who can plan and arrange music with a clear cut idea of what they're doing and knuckle down to it. I guess that's why I'm a hobbyist instead of a working muso