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
True. Drummers and percussionist are the main source on rhythm other than the director or conductor.
With love,
Hope :)
D. Music has adapted to all of the technology that it is likely to