It's a horn of some kind.
Johann Sebastian Bach's main instrument was the organ.
A secondary instrument is a instrument whose sound is in comparison to the main instrument. It also can be a back up instrument.
The main characteristics of a negotiable instrument is that it can be easily regulated.
Johann Sebastian Bach's main instrument was the organ. He was a renowned organist and composer known for his mastery of the instrument and contributions to organ music.
piano
the violin
the fidle
the piano
its piano
the saxophone
classical piano
The Tenor Saxophone, a female voice and Percussion!! (In order of main to least)