@TeamYouTube If I post a video with someone else’s song and credit them, all the money from the video will go to the person who’s property I used? 
Your best resource will be the Copyright section of our Help Center, start with these top FAQs: https://goo.gl/FzBC2x . You can also review info on fair use, creative commons, and our troubleshooter linked from there. Hope these resources help answer your questions.