A musical pause is called a fermata. This is different to a rest. A fermata is not counted, but a rest is. Also, a note can be sustained through a pause, but not in a rest.
choir or orchestra is another word for music group
assai - very, in music
yes
Perhaps you are looking for the Sound of Music.
authorized
Adagio.
Melodrama .
Composing is another word for writing music.
In French a music lover is a "Melomane" Audiophile
A sheet of music, or manuscript, if it's handwritten.
Cows
a song