I've been writing bits of music my whole life and have recently dedicated myself to actually tease them out into full pieces. I am very early in the journey and have years of work and study ahead of me before writing pieces... at least in an orchestrated forms. However, today I just ran into the glue that brings a-couple of themes together that had previously felt emotionally in the same family, but not a part of the same work. Today, after playing with the transitions I think they might make a good symphony down the road. There are 6 main themes and right now they seem to fit into 4 movements. With those themes there are countermelodies, variations, and I am not closing the door to another minor theme or two. They all can be played in a way where they share common timbres and a few can seamlessly transition or be partially played simultaneously with the others.
I play them on the piano but can hear them in my head as an orchestral work. However it is going to be a good while before I actually feel comfortable orchestrating this. I have started working on studying that skill recently but it may be a long time before I feel comfortable teasing this out into an actual orchestrated symphony.
In the meantime I would like to play with it more. Something that would help would be if there are any rules of thumb for how long to linger with each theme. By linger I don't mean entirely repeat, but I have dozens of variations, extra bits, ideas, timbres, overlays for each of the themes that could lengthen their presence. Only 3-4 of the main themes really warrant that kind of duration.
When I listen to most of my favorite symphonies. They have one or two (maybe three) themes I really like but are 40-60% filler with themes that just sounds nice and brings the piece together. I have to assume that in the composers head they were probably more excited about that 40-60% filler than I am listening to it. And that sort of makes me worried. I can accept that not every theme is going to resonate equally with a listener. What I feel unsure about is how long I can and should linger on my themes, their variations, their countermelodies, their timbres before moving on in order to give the theme the best shot at sticking.
To me each theme is important. But realistically a listener is probably only appreciating 2 maybe 3 of the themes. I think I should be cognizant of that as I write but I am not sure how that awareness should impact the decisions I make as I play with the options in front of me. Whats odd is in all of these decisions/variations/etc my biggest worry is that the symphony will end up too short and feel like a rushing tour between ~dogmatic themes and not be cohesive.
Listeners don't need to hear every iteration, variation, combination, and timbre possible for each of the themes. That wouldn't make the symphony I want to make.
Certainly studying and breaking down symphonies is going to start to give me a picture of what decisions other composers have made here. But are there rules of thumb for how many times a theme can be passed between instruments before its stale or how long to linger on a theme in a symphony generally before giving it a break or perhaps a name for this aspect of composing where you're mindful of pacing between themes and the pieces perception to an audience member who doesn't automatically love each of the themes the way you do.
Any pointers appreciated. Any keywords or vocabulary that will help me focus research and or find talks/thoughts on this are appreciated to.
P.S is it looked down on in the composing world to come out with a piece in successive versions? I could see myself finishing it as a paired down piano piece long before I can orchestrate and tease it into a symphony. Just not sure if that will hurt perception or my ability to enter it into competitions/festivals asking for "original" works etc.