Around-robin tennis tournament consists of each player playing every other player exactly once. how many matches will be held during a n-person tournament, where n > 2?

When cecil sharp came to america to collect songs, he found what is considered modern country music today?

Natural minor half steps between scale degrees 3 and 4; 7 and 8 harmonic minor half steps between scale degrees 2 and 3; 5 and 6 ascending melodic minor half steps between scale degrees 2 and 3; 5 and 6; 7 and 8 major half steps between scale degrees 2 and 3; 7 and 8

I’m a paragraph of no less than 125 words, explain the single most important factor involved in advancing american classical music in the twentieth century.