Abstract: B/F tenor trombone for children, comprising a sound part and a slide, composed of an inner slide and an outer slide being movably disposed thereon, wherein the total length formed by sound part and slide has a tubing length Ls1+Ls2+Ls3+Lz1+Lz2+Lz3, and wherein in the 1st register, the slide has a tubing length Lz1+Lz2+Lz3 of less than 150 cm, and wherein the sound part has a tubing length Ls1+Ls2+Ls3 of more than 125 cm.