Remixes

How much music of another artist can I use as a sample, and still be able to post it in the showcase?
I created an original percusion rythym, then added samples of a pop artist's music, but basically a remix.

Does this violate the showcase agreement, requiring copyright ownership of all the music used in a beatmaker creation?

I just finished a beatmaker project, and a "challenge" with a long time friend and seasoned beatmaker user, to get me
motivated to finally use the app I bought when it first came out.

I'd like to post it, but I'm not sure if I can.

Thanks.