Is it okay to upload?

Is it now okay to upload songs onto youtube of you doing a music video to them? Since youtube now just puts ads on those videos?? And what is the point of pitching up the songs and speeding them up i see some people who do music videos to popular songs doing that?

(A1) Depends on the distributor and how unique the video is. (A2)Pitching up / down of songs - To avoid copyright. Inverting video's - Avoiding Copyright.