Korsakov - Russian Easter Overture
Advice
This is one of Korsakov's famous second trombone excerpts. It is also a bit of a weird solo. The notes and rhythms are very simple, but the style and musicality are the key. Listen to all recordings on repeat until you get the correct idea in your head. I recommend recording yourself and listening back to find areas for improvement.
Resources
Full Piece Recording - Mariinsky Orchestra, Gergiev
Excerpt Recording - Jeffrey Kant
Korsakov - Scheherazade
Advice
This is another famous second trombone excerpt. Make sure to listen to recordings to know how this should sound dynamically and stylistically. Learning how to gain the control to play loudly with a full sound and good tone in an orchestral setting is a process that requires lots of practice.