I am looking at a 1954 edition of Jean Sibelius's orchestral score for Tapiola.
It has the Concert Pitch instruments (Flutes, Violins etc) in two sharps.
He then has various other key signatures which don't seem to match up. For example he has Clarinetto Basso in B, Corni in E, and Trombe in B; staves with no key signature.
Clarinetti in A has one flat; Corno inglesi has three sharps.
So now I'm really confused.
I was expecting that the Bass Clarinet would have a Key Signature of three flats assuming that Clarinetto Basso in B means that it sounds one semitone below written pitch.
Can someone explain what's going on?
I've only read full scores concert pitch so this has me confused.
(Quite apart from the fact that AFAIK Bass Clarinets are Bb.)