Felix Alexandre Guilmant (1837-1911) was a French organist and composer. He got his start in his hometown of Meudon before moving to Paris in 1871 as the organist at the Holy Trinity church. While occupying that position for for 30 years, he developed an international career as an organist, touring Europe (especially England), the United States, and Canada. He was also something of a scholar, helping to collect two multi-volume anthologies of early organ music by French and non-French composers. His compositional output is more copious than his opus count (he reached 94) suggests, since many of his individual compositions were in fact collections of many smaller pieces. His greatest contribution was to the organ repertoire, both as a composer and a scholar, but others of his works have stood the test of time as well.
One of those exceptional Guilmant works is his Morceau Symphonique for solo trombone and piano. It was written in 1902 as an examination piece for the trombone students at the Paris Conservatory. It remains a beloved staple of the solo trombone repertoire, and thus it has been arranged several times for different accompaniments. Here is the original version with piano:
And a version arranged by Wesley Shepard for band:
And finally, an organ version very much like what Guilmant may have come up with himself:
Read more about Alexandre Guilmant at Wikipedia and AllMusic.