Hi Maarten,
A generic question:
* If the key is C-minor, and I want a trill on (midinotes) D# and E,
what would the correct trill notes be?
Depends on the context -- i.e., which note is the "fundamental" and
which is the "embellishment", as well as the underlying harmonic
structure (chords, etc.).
* Is the correct method suitable for each instrument? Or are there
instrument which would prefer a specific one of these options?
Harmonically, there is only one "correct" answer -- from a
performance/engraving perspective, there may be other ways of writing
it which are easier to play (based on fingering, ease of
sight-reading, etc.).
Hope this helps!
Kieren.
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