Answer:
the piece is subject or matter
Explanation because the artist had a lot of thinking to do with this one
Answer: 20th century there was a large increase in the variety of music that people had access to,Sound recording was also a major influence on the development of popular music genres, because it enabled recordings of songs and bands to be inexpensively and widely distributed nationwide or even, for some artists, worldwide.
for more ex go here
https://www.classicfm.com/discover-music/periods-genres/modern/
Rule of thirds
It could be portrayed as the color or just overal photo
