Is A440Hz or 432Hz? This to me is a larger question than composition styles.
https://roelsworld.eu/432-tuning/the-scale-of-fifths/ this goes far more in depth
It’s ultimately just preference though. To that end some symphonies use other options, ny philharmonic uses 442, Boston symphony 441, etc. When I marched and teched drum corp we did 442 because that’s what the marimbas were tuned to plus we performed outside in the cold so going up a touch helped as the cold would generally pull everything flat.
It does not matter. Here's some reasons why:
- You can change it at any point. Re-tune your orchestra. Pitch bend your mp3 file in Audacity. It's free to change your mind. Decisions which are free to change do not matter.
- Most humans basically don't notice it. The very few that do have a good enough ear to notice it will forget about it within seconds unless your song is extremely boring. If your listeners are focusing on a 2% difference in tuning instead of the content of your song, your song sucks.
- Written scores literally do not specify it; that's how little it matters. People do not have this in mind when they write music because it doesn't matter. They write the tempo, the key signature, the exact notes, but they don't write the exact tuning of A4. They don't care.