Symbols of Audio

I was interested in music, and I wanted to use music as the subject.
So, I tried to draw album artwork first.
 

However, after drawing a few, I noticed that album artwork doesn't work,
because of the amount of information it contains.
 

Then, I decided to draw record label logos.
Since logos are precisely designed, I traced them.
 

As I traced many logos, I realized most were black and white. I wanted people to see and compare each design, so I left them as outlines.
 

I learned that people are unfamiliar with record labels through discussion.
I wanted viewers to become familiar with them, so I categorized them by
music genre.