Bizet - L'Arlésienne Suite No. 2
General Advice
This is one of the most challenging excerpts for bass trombone because of the range it demands. It can be helpful to keep a second, smaller moutpiece with you for this excerpt. This can be especially helpful if you are performing the entire piece. Practice it slowly with meticulous attention to detail in the rhythm, and work the tempo up to the requried BPM from there.
Resources
Full Orchestra Excerpt Recording - Berliner Philharmoniker