Articles about musical instruments of all kinds - from violins to drums to guitars to pianos to keyboards to saxes to trumpets to... home :: slide trombones How to select a trombone Slide into a new 'bone! A trombone is a musical instrument made of brass, with a long cylindrical tube, with a bell like mouth, and a movable U-shaped slide to generate various pitches. Because of this, it is important for trombone players to develop a good ear, as even the sligh..