I am doing orchestration homework and I have to go back and forth within the same flow between having a key signature ( with a transposing layout) and no key signature. If I just put C major key sig then the clarinets are showing D major, but I need them to not show anything and use only accidentals when needed. But, the issue is this is a measure following a measure where there is a key signature. Help?
Use Atonal as the Key Sig.
But be sure to label your MS “Transposed Score” so folks will know to read Clarinets, etc. as transposed.
This reminded me of a modernish (late-20th century) brass quartet I purchased by mail order some years ago. Written for 2 trumpets and 2 trombones, it gave no indication as to whether the trumpets were in C or in B♭. To see if I could figure it out for myself, I played it through on the piano - the first time treating the trumpets as being in B♭, the second as being in C. In one play-through, the two outer sections sounded fine and the middle section sounded absolutely terrible. In the other, the two outer sections were abysmally dissonant while the middle section was quite pleasant! I think it never received any further attention from me, and is now probably in the same place as lost socks.