For the team’s answer,

dj: "russia—busshunter"

Piano: "river flow in you" "cut in love"

Japan and South Korea: "The Third Year of Change" is very old and classic. "Rease my soul", "Jun's がくれたもの", "Gangnam style"

Europe and the United States: It's hard to say, first make it clear what type you like. "rolling in the deep"

Classical: "Nocturne Secret Garden", "down by the salley garden", "Every Heart Moves", "Happiness"

Violin: "Greetings from Love"

Others: "The Banquet" and "Forest Rhapsody"

It would be better to add more if it were explained more clearly