Can you play in any key on a Bflat clarinet?

While you can make some adjustments to play in different keys on a Bb clarinet, the instrument's primary key is Bb major. To play in other keys, you would need to use alternative fingerings to raise or lower certain notes and/or add or remove additional key work with attachments.

It's not advisable to go too far from the B-flat tonality on a non-transposing B-flat clarinet as the adjustments become increasingly challenging and potentially damaging to the structure of the instrument without modifications.

Professional clarinetists often use additional key work attachments as mentioned earlier as it is possible but requires extensive experience and a deep understanding of music theory on clarinet technique.