A more detailed look...
"...the best clarinetto basso I have ever met"
Conductor Laureate, BBC Philharmonic
Chief Guest Conductor, Israel Philharmonic
Maurice Ravel La Valse
Bass clarinet in B flat transposed
from original part in A
ORCHESTRAL BASS CLARINET PART
Transposed from A to B Flat - $7.50
Ravel wrote the bass clarinet part in his great work La Valse for bass clarinet in A. La Valse is a major work for bass clarinet and is on most, if not all, bass clarinet orchestral audition lists. It is a very difficult transposition and the notes com fast and furious.
Every professional bass clarinet player that I know has their own part for La Valse copied out for B fla bass clarinet. While there are numerous works in the bass clarinet repertoire for bass clarinet in A that are easily transposed at sight, none of my colleagues take the chance to transpose La Valse at sight.