First and foremost, I'm a mix of mixes.
My first mix consists of what I have one, and what I have seven
What is subject to change,
The result of eels and a madman.
After that, I am a mix of love and music
Of grace and agility,
Of shaking and screaming.
My last is a mix of everything
Multitudes of genres
And yes, the answer is one.
It's abbreviated to 3 letters.
what I have one, and what I have seven: look at that blue box.
The result of eels and a madman.: think