How do I determine whether to write in E-flat or D-sharp?

if asking question, piece in eb.

d# real key, particular spelling, i.e. d# major / minor, occurs in piece modulation has taken d#: 'grammatical' likelihood modulation eb or relative slight.

keys mistakenly called 'theoretic' - i.e. notion not exist... reason being in d# major, example, signature need include double sharps. 'theoretic' keys actual, , here , there, later romantic era, there plenty of literature piece modulates g#, g# minor, etc.

spelling matter of proper musical 'grammar.' similar reasons of not repeating letter name in scale (or why c minor not c, d, d#, f; too, reasons 'grammatical' whether in eb or d# :-)

grammar , spelling principles make composer choose 1 spelling on another.

there exceptions in relation orchestration, , tradition of, say, harpists being happier seeing flat or double flat before prefer read sharp, idiosyncratic instrument, not proper grammar , spelling of harmony.


best regards.

in composing piano piece in key of e-flat/d-sharp, how determine use? arbitrary, since same key, or there times when 1 more appropriate other?

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