To me, it looks as if they're changing it to include modern media like streaming and all. There is currently a law just like this in place for older media. It states that if you create at least 10 copies of 1 or more copyrighted work within 180 days, and if it exceeds the value of $2500, you will be punished. If you posted something that would be illegal, you won't be punished for a single video. If you devote the entire youtube account to posting copyrighted works, however, you could be punished. Let's Plays would still fall under fair use, and would remain as they are. Posting a full song or movie without proper consent from the original author would be considered illegal under this bill. This is no big deal, to my understanding. I don't find that there is a point to posting songs on youtube other than to get views on your channel, especially with Vevo integrated with Youtube and services like iCloud and Spotify coming very soon.