Music: instrumental or voice sounds (usually are both combined) in a way that it produces harmony, beauty sounds and expression of emotions.
The music is an art that allow us to express our feelings and the people that heard that identify whit it.
We can found differents genres in music because in the throught out the time the people have created their own music.
Like all the things in life, the pop music has evolved throught out the decades for example the walz in the 00s, Tango in 10s, Charleston in 20s, Jazz in 30s, Salsa in 40s, Rock n' Roll in 50s, Ballad in 60s, Disco in 70's, Pop in 80's, Rap in 90's.