How have music festivals become popular and profitable?

Briefly explain why you are interested in stuying your topic:

I have bee involved with music all my life. It started in elementary school just singing in the chorus, then in middle school I did the chorus but joined the after school programs too. When I got to high school I have been involved with the choirs all four years moving up each year. Now that I am in high school, one of the things I enjoy most is going to music festivals and concerts with my friends, but I never knew of or wanted to do that when I was younger so I want to know how plenty of other and I got interested. 

The overall question I plan on answering by the end of the project:

How have music festivals become popular and profitable? 

Sub questions I will need to answer in order to answer the overall question:

When did they become popular?

How do these festivals get put together?

How much does it cost to put together these concerts?

Why do people go to these concert festivals?

My plan of research (what specific Library Databases, specific websites, names of authors, people, etc. will I pursue to find answers to the questions above):

A lot of interviews- brother who works for a company that puts together these festivals

Databases