Also I wanted to share that copyright for companies last for 100 years. I also learned in the everything is a remix part 1 and 3 that everything that we hear in today’s music is probably already taken from someone before. I also learned that people’s ideas are not there own or that people think at the same time. For example the social networks like Twitter and Facebook came out around the same time.
Reference: A Fair(y) Use Tale, Everything is a Remix Part 1 and Part 3 Examples: Barack Obama Singing Call Me Maybe by Carly Rae Jepsen, Buffy vs Edward: Twilight Remixed, Take On Me: Literal Video Version