It's true. And thanks to YouTube user GameFreak2413, you can hear all of them in order for 2 minutes and 46 seconds.
At some point, there's going to be a season 10 of the series. Just imagine that supercut video.
I found this video in a post at Nerd Bastards. It rounds up 25 excellent supercuts, including some for Star Wars, Doctor Who, Game of Thrones and Harry Potter. You can watch them at the link.