I’m guessing it wants you to fill in two major key signatures like D major and C major also with two minor key signatures like A minor and B minor. I picked those key signatures because A minor is the same as C major but it starts on A and D major and B minor is the same but it starts on B
I think the answer is <span>The 1844 Treatise on Modern Instrumentation and Orchestration. This handbook was created by Berlioz to introduce the aesthetic of the expressive music of the opera. The handbook was also used as a principle on how to create similar style of Bach and to the other romantic composers during their time</span>
<span>A sudden change in the level of sound
Good luck! :D</span>
Hmmm im going to go ahead and say D for leather bag
