sentences:  Having valves and the same tubing length, the bass trumpet is quite similar to the valve trombone, although the bass trumpet has a harder, more metallic tone.Certain modern manufacturers offering 'valve trombones' and 'bass trumpets' use the same tubing, valves, and bell, in different configurations - in these cases the bass trumpet is virtually identical to the valve trombone.The earliest mention of the bass trumpet is in the 1821 "Allgemeine Musikalische Zeitung", in which Heinrich Stölzel's "Chromatische Tenor-trompetenbaß" and Griesling & Schlott's "Chromatische Trompetenbaß" are described.