Definition or classification essay on music; 'Entertainment, Emotions, Health'

I have to write a definition or classification essay on music. After seeing my outline, my professor told me it would be best if I used the definition format, but I am confused on how to go about doing that.

Heres my outline:

Primary principle of classification: Music
Category 1: Entertainment (only used in opening paragraph not category)
One way people use music is as a form of entertainment.
Concerts- brings people with similar taste in music together
Parties- Music is almost always used during parties, to help bring people together, with dancing.
Radio in car- Avoiding boredom in while driving.
Ipods- listening to music while out.
Category 2: Emotions
Music can influence emotions and mood.
Listen to certain music when happy or sad
Motivation while exercising-Listening to certain music could actually help you run faster.
Music heavily connected to memory which allows music to cause emotional reactions.
Music used as an outlet for expressing emotions
help when feeling stressed
Category 3: Health
Effects music can have on health
song and rhythm can rewire our brains to overcome brain damage
Improves memory
Music helps with anxiety
Lower heart rate, blood pressure

If anyone can help with how I should organize the essay that would be helpful too!
Thank you:)

If I was you I would look up statistics on the effect music has on health/emotions. I bet there have been a lot of studies conducted about the relationship of the two and they could be easily worked into your essay.

Dear Orangeeskies.

Your topic seems to be interesting to me. The good thing you already started your thought process for each category. I would suggest you should start with a good introduction seeking readers attention and then in introduction you can define categories like.

Category 1: Entertainment
Category 2: Emotions
Category 3: Health

Having said that then you can elaborate each category with examples to give a impression to reader about the definition of each category. I think overall you can write a good essay so organize your thoughts and put everything together for review, then many can help you.