DJ app

Hi

I'm looking for a excellent dj-app. I see several on the app-store, but don't know which one to choose.

My music library is very large. It is impossible to place all my tracks on my iPad.

Is it possible to connect the ipad to my macbook pro and mix the tracks from my macbook pro on my ipad.

I could use my macbook to prelisten to the tracks and mix them on the ipad.

Any solution would be welcome.