Very necessary

My good friend introduced me to a site called culturegraph, self described as "accountants meet pop culture." Essentially, pop culture references are transformed into charts and graphs with very clever results. Here are a few of my favorites, but as I don't understand all of them, you should check it out on your own.

I'm always singing something in my head, and P and I often make puns using pop culture references, so I feel like I've been practicing for this type of exercise for years. Here's my first attempt:I also considered creating a mock math equation to read:

Hooker
--Fee
=======
Ho

The actual line goes, "The difference between a hooker and a ho ain't nothing but a fee." Figured that level of detail might be too obscure, though.

Both are from the same song. Can you guess the reference?