Kevin Barry <barr...@gmail.com> writes: >> Both cases were discussed. For an orchestra they are not the same > pitch, thus formally a slur. > > You cannot make this assumption. It is exceptional to distinguish D > sharp and E flat since most performed orchestral music is equally > tempered. It is common, for example, for a composer to write D sharp > for some instruments and E flat for others.
Distinguishing D♯ from E♭ formally when some instruments are written in transposing keys is also a recipe for trying to read more into the intonation than the composer was intent rather than forced to place there. -- David Kastrup