Songs that were country: 3/10 (It was before 15/50, till I divided the numerator and denominator by 5 to get my answer, and the simplest answer is 3/10.)
Rock songs: 2/5 (It was before 20/50, till I divided the numerator and denominator by 10 to get my answer.)
World songs: 1/5 (It was before 10/50, till I divided the numerator and denominator by 10 to get my answer.)
Classical songs: 1/10 (It was before 5/50, till I divided the numerator and denominator by 5 to get my answer.)