Classical. "This arrangement of the first movement of Mozart's Symphony # 40 has no extreme registers in the trombone parts (several Dbs in tbn 1, but the vast majority of tbn 1 stays below Bb). Although loaded with notes, the arrangement is technically quite playable (particularly if taken a bit below tempo--it still sounds good a bit slower). The challenge is endurance. If performed by a choir, this is not a problem--players can just spell each other. Since there are a lot of notes and not much rest, care has been taken to provide adequate breath marks, and to avoid awkward leaps. If endurance becomes an issue, it's a simple matter to shorten this arrangement: since it is sonata-allegro form, it is possible to end at the conclusion of the exposition (bar 52). This reduces the length to 1/3rd of the arrangement's original length. Or, for a longer arrangement, play the exposition through twice (common practice in sonata-allegro form). This is efficient, since players only need to learn the first 1/3rdof the arrangement." -the arranger