I'm sure this has been posted over a million times, but I can't find a definitive answer. I'm sure that many people have heard of the song "Slide" by Calvin Harris. I love this track, so I sampled the piano loop at the beginning of the song (only piano). I then slowed it down, and added my own things to just the piano loop (808's, drums, etc...). Obviously Calvin Harris did not give me permission to use this clip, but I was wondering if this still falls under fair use? It is a 15 second sample of piano, is this okay to post? Thanks.