Abstract: A brass wind instrument which changes pitch by varying the tube lengths thereof which includes a slide portion which is substantially half the physical length of a conventional slide. The slide assembly comprises two substantially U-shaped tubes which slidably engage corresponding tubes on a fixed portion of the trombone. The fixed portion of the trombone accommodates a conventional bell and a conventional mouthpiece. The slide assembly includes first and second substantially U-shaped slide tube members each having a pair of adjacent legs that slidably engage the fixed portion of the trombone. The slide assembly is configured such that customary pitch positions are obtainable.