The superbone (sometimes known as the double trombone) is a hybrid tenor trombone in B that has both a slide like a regular trombone and a set of valves like a valve trombone. History Trombones that combine both a slide with a set of valves were built as early as the 1860s by Besson. One of the earliest surviving examples was built by Conn in 1884, and closely resembles the modern superbone that appeared in the 1970s. Conn manufactured them through the early 20th century, and a similar instrument with a shorter four-position slide, the valide, was invented by jazz musician and machinist Brad Gowans in 1946. The term "Superbone" was first coined in the 1970s as a name for the instrument patented by Larry Ramirez of Holton Musical Instruments in collaboration with jazz trumpeter and bandleader Maynard Ferguson. It is very similar to the early Conn hybrid instruments from the 19th century, with a very narrow bore of and three piston valves. It has a slide lock, which frees the player to operate the valves or the slide with either hand, and was manufactured by Holton as the model TR-395 "Superbone" between 1974 and 2004. The Holton became a staple instrument for Ferguson, and Don Ellis in his later career. Ferguson used the superbone on the recording "Superbone Meets the Bad Man" from the Chameleon album. Ashley Alexander, another proponent of the instrument, recorded "Spring Can Really Hang You up the Most" on his Secret Love album, which demonstrates the instrument's flexibility. Alexander referred to the instrument as a "double trombone" and wrote a method for it, published by Leblanc in 1980. Later developments In the early 2010s James Morrison in conjunction with Austrian instrument manufacturer Schagerl created his own version of a superbone, employing a larger bore and three rotary valves operated by the left hand. This arrangement allows the player to use the valves and slide independently or simultaneously. Wessex Tubas also manufacture a superbone with the same larger bore, but with three piston valves similar to the Holton. Construction Superbones, unlike the valide, have a fully functioning trombone slide with the usual seven positions. The Holton and Wessex instruments are assembled from three detachable sections; the slide and bell sections attach to each end of the valve assembly, built with three piston valves arranged in the same manner as on other three-valved brass instruments. The player