The Richard Strauss, "Processional Entry (Feierlicher Einzug)", was originally for a massive brass ensemble that consisted of (if my memroy serves me correctly) over 20 trumpets in Eb. There were 4 horns, 3 or 4 trombones, two tubas and tympani. Our large version of the Homewood Brass Consort(
http://www.homewoodbrass.com) uses a reduced arrangement by Brass Ring Editions that employs 4 trumpets in Bb, 1 horn, 4 trombones, tuba and tympani. It is quite strenuous, so, assistants, where possible will be welcome. There is another version of this piece that the quintet version of the Homewood Brass Consort uses for brass quintet and organ. Again, the brass parts are not for the faint of heart, but, the sound is worth it.