This is a transcription of Ferde Grofe's Cloudburst from the Grand Canyon Suite. It is not easy and would probably get a 5+ on the J.W. Pepper rating scale. Cloudburst lasts 9'19". It is played by the South Jersey Area Wind Ensemble. https://www.youtube.com/watch?v=AmMXEHbVwIU or click the picture of the band.
Cloudburst from Grand Canyon Suite - concert band