Using the term "musical" to describe a work would not be capitalized. In a respect, it is no different than saying a novel is a "book."If you were to say, "We went to see the musical The King and I," you would capitalize only the actual name of the musical, not the word musical itself.
Organ
That would be a glissando.
accordion
The oboe is a musical instrument. The organ is a musical instrument.
"The" is used as an article, and "first" is an adjective used to describe musical broadcast. Musical broadcast would be the common noun.
short musical idea
An organ system
organ
Type of organ (musical instrument)
His main instrument was the pipe organ. He also played the harpsichord.
Arthur Wills has written: 'Organ' -- subject(s): History, Organ (Musical instrument), History and criticism, Organ, Organ music