They are pitched in B♭, an octave below the B♭ trumpet and an octave above the B♭ bass tuba. These are treated as non-transposing instruments, reading at concert pitch in bass clef, with higher notes sometimes being notated in tenor clef. The most frequently encountered trombones are the tenor trombone and bass trombone. The trombone has a predominantly cylindrical bore like the trumpet, in contrast to the more conical brass instruments like the cornet, the euphonium, and the French horn. The word 'trombone' derives from Italian tromba (trumpet) and -one (a suffix meaning 'large'), so the name means 'large trumpet'. The valve trombone is an exception, using three valves similar to those on a trumpet, and the superbone has valves and a slide. Nearly all trombones use a telescoping slide mechanism to alter the pitch instead of the valves used by other brass instruments. As with all brass instruments, sound is produced when the player's vibrating lips cause the air column inside the instrument to vibrate.

I am saying that there are certain situations where a valve trombone has its uses.The trombone ( German: Posaune, Italian, French: trombone) is a musical instrument in the brass family. Slides have many advantages (less resistance, pitch adjustment, slide vibrato, glissandi, etc.) and are almost always more appropriate than valves. Now I'm not saying that valve trombones are inherently better than slide trombones. The valves also allow for half-valving if that is needed for whatever reason, although this could be done using a trigger (albeit less convincingly since there is only one valve) It is more compact and makes it better for marching or traveling. Less notably, the valve trombone doesn't extend past first position since it doesn't have a slide and can also be made into the short form configuration and marching configuration/flugabone. On a valve trombone you can trill cleanly between virtually any note except certain low register trills (mind you these would be hard if not impossible on slide trombone as well). You can sometimes use a trigger to trill but it's still rather limited. You can only trill up to the next partial, which may or may not be the distance you want to trill. Normally trombonists will use lip trills, but the issue with this is they are very limited when it comes with intervals. The valve trombone also allows for better trills.

Giuseppe Verdi for this reason chose to write for valve trombone in his operas. In this video, you can see that hear that the valve trombone has much cleaner and lighter slurs, especially when you would have to double tongue on slide. The valves allow for cleaner slurring, especially in very fast passages. As much as some people like to hate on valve trombones for being a crutch not to learn slide (and there are definitely people who use it as such), the valve trombone has advantages over the slide trombone in a few situations.

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