Samples of the playing of the Texas Tech University Trombone Choir can be found here:
http://www.edwards-instruments.com/reso ... /ttu.shtml
Of course they don't play low conical brasses, yet good playing always should be considered inspiring. Even the more as this trombone choir follows a sound concept, which is not far from that of a lean euphonium. Obviously no Bach 42's here. In some spots the sound even comes close to horns.
For me the best clips, especially intonationwise, are the Italian Dance (for me the first sample of worthwhile music coming out of that publishing house) and Finlandia.
That the sound concept is not a matter of odd hazards finds a proof here:
http://www.griegomouthpieces.com/Mercha ... ry_Code=CD
And no, I don't get any kickbacks.
Klaus