Which city is known as "Music City"?

Which city is known as "The Big Easy"? Which city is known as "The Mile High City"? Which city is known as "Motor City"? Which city is known as "The City of Brotherly Love"? Which city is known as "Sin City"? Which city is known as "The Big Apple"? Which city is known as "Beantown"? Which city is known as "The Emerald City"?