Flouishes decorative extensions and undulating baselines apply to which type of design

Ineed some on finding music. i have a nephew who is into rap, but when i find a rap song, it seems to either be too old for his taste or to him it isn't good enough. can someone suggest some good music for me to see if he likes it or not?

Blues musicians used alterations of the major scale that became known as blue tonality by

What does bts stand for? what is the importance of bts? who first started it?