I don't arrange for insanely talented groups with incredible ranges. Just "good" groups. Nothing above a Bb in any part. I like to "share the load" by moving the melody around within the pieces between all 4 parts to keep it interesting.
You can check them out yourself at https://jvgmusiconline.org. Every quartet comes with the parts in 3 clef options:
Parts 1-3 - bass, tenor, treble clef
Part 4 - bass, Bb treble, Eb treble
Optional Percussion (if called for)
I have created printable double sided book collections as well with indexes, separating out the Christmas music
101 Christmas Trombone Quartets ($ 50.00 CAD)
150 Trombone Quartets ($ 50.00 CAD)
If you purchase one of the 2 books above, you will also instantly have access to download the individual quartets of that type (Christmas or non-Christmas). Note that this includes all FUTURE quartets that I will arrange.
Most are also available on SheetMusic Plus and Sheet Music Direct where you can pay twice as much for the same piece

Tell me if you think that is a good deal and if you like the arrangements