Question: What uncommon instrument is used in the musical Edel Rhapsody?
Context: Sakha Rama Rao (Sakharam Rao) is an Indian musician credited with having re-introduced the south Indian chitravina (or "gotuvadyam") to the concert scene.  However, it was his father, Srinivasa Rao, who made the pioneering effort towards the reincarnation of the chitravina in modern times.  He was an ardent music lover and an amateur artiste himself.  He started experimenting with a slide on the tanpura (a four-stringed instrument, usually used as a reference drone in Indian music).  Sakha Rama Rao was drawn to this instrument since childhood.  He was able to perceive its tremendous potential to produce high-class music.  He re-designed this instrument as a fretless veena with its usual set of seven strings - four strings on the top and three in the side for drone and rhythm.  He put in arduous practice on this instrument and gave occasional performances.  Since he was not aware of the history of the instrument, he gave it a new name - gotuvadyam.  This is because, he used to casually refer to the slide as 'gotu'.  'Vadyam', in Sanskrit and many other Indian languages, means instrument.  Thus, 'gotuvadyam' was a literal name for an instrument played with a slide.  Several decades later, Ravikiran, along with a few other scholars, studied about the origins of the instrument and eventually restored the more traditional name, chitravina.  Sakha Rama Rao was a "musicians' musician" and trained many great artists like Gotuvadyam Narayana Iyengar and Semmangudi Srinivasa Iyer.  Soon there were several others who started performing on the chitravina (gotuvadyam). A signal instrument is a musical instrument which is not only used for music as such, but also fit to give sound signals as a form of auditive communication, usually in the open air.  Signal instruments are often contrasted with melodic and diatonic or chromatic instruments ("a musical (rather than signal) instrument" is not uncommon phrasing). A musical instrument is an instrument created or adapted to make musical sounds.  In principle, any object that produces sound can be considered a musical instrument—it is through purpose that the object becomes a musical instrument.  The history of musical instruments dates to the beginnings of human culture.  Early musical instruments may have been used for ritual, such as a trumpet to signal success on the hunt, or a drum in a religious ceremony.  Cultures eventually developed composition and performance of melodies for entertainment.  Musical instruments evolved in step with changing applications. Rhapsody Rabbit is a 1946 "Merrie Melodies" animated short subject, featuring Bugs Bunny and directed by Friz Freleng.  The short was originally released to theaters by Warner Bros.  Pictures on November 9, 1946.  This short is a follow-up of sorts to Freleng's 1941 Academy Award-nominated short "Rhapsody in Rivets", which featured the "Hungarian Rhapsody No. 2" by Franz Liszt.  The "instrument" used to perform the "Hungarian Rhapsody" in "Rhapsody in Rivets" is a skyscraper under construction, while this short features Bugs Bunny playing the piece at a piano, while being pestered by a mouse. An electric musical instrument is one in which the use of electric devices determines or affects the sound produced by an instrument.  Electric musical instruments are an example of electric music technology.  It is also known as an amplified musical instrument due to the common utilization of an electronic instrument amplifier to project the intended sound as determined by electric signals from the instrument.  Two common types of instrument amplifiers are the guitar amplifier and the bass amplifier.  This is not the same as an electronic musical instrument, like a synthesizer, which uses entirely electronic means to both create and control sound. Kenneth Lee "Ken" Butler (born August 3, 1948) is an artist and musician, as well as an experimental musical instrument builder.  His Hybrid musical instruments and other artworks explore the interaction and transformation of common and uncommon objects, altered images, sounds and silence.  The idea of bricolage, essentially using whatever is “at hand”, is at the center of his art, encompassing a wide range of practice that combines live music, instrument design, performance art, theater, sculpture, installation, photography, film/video, graphic design, drawing, and collage. The Wagner tuba is an infrequently-used brass instrument that combines tonal elements of both the French horn and the trombone.  Wagner tubas (or "Wagnertuben") are also referred to as Wagner horns or Bayreuth tubas in English and as Bayreuth-Tuben or simply Tuben in German.  The term "Wagner tuba" has been used in English since the 19th century and is standard today.  Wagner's published scores usually refer to these instruments in the plural, "Tuben", but sometimes in the singular, "Tuba". The Edel Rhapsody is a musical work written in 1993 by British composer Stephen Caudel.  He was commissioned by the North Pennine Orchestra along with Northern Arts to create a new musical composition for the little-known 19th-century instrument the Wagner tuba. Suite in E minor, BWV 996, is a musical composition written by Johann Sebastian Bach (16851750) between 1708 and 1717.  It is probable that this suite was intended for lute-harpsichord.  Because that is an uncommon instrument, it is in modern times often performed on the guitar. Uncommon Ritual is the second album released by Sony Classical of string trios, following Appalachia Waltz, with unusual instrumentation and influences from bluegrass and folk music to create an Americana-style of traditional classical music.  "Uncommon Ritual" adds jazz, blues, and elements from world music to the mix.  Regarding the genre-defying nature of the music, New York times music critic Ben Ratliff wrote, "Despite its inclusion of Bach and Pablo de Sarasate's "Zigeunerweisen", "Uncommon Ritual" is not a classical album.  But neither does it belong to bluegrass, traditional Irish music, jazz or any of the other traditions it lightly borrows from.  It's sort of a chamberized health shake of music that's acceptable to a National Public Radio listenership: it comes with an unmistakable patina of culture, the pieces are brief and funny and the sound of the music is comfortably familiar."  The trio includes double-bassist and composer Edgar Meyer, banjoist and composer Béla Fleck, and mandolin player Mike Marshall.  The album is noted for the variety of instruments used, and the performers' ability to change instruments fluently within songs.  The pairing of these three musicians was new for the recording of this album; however, Meyer and Fleck's musical relationship dates back to the mid '80s.
Answer: Wagner tuba