Let’s end a rather hellish week of news with a look at the Stairway to Heaven controversy. In a much-watched case, Jimmy Page took the stand to face plagiarism-related questions about Led Zeppelin’s biggest hit. While Zeppelin has been accused of borrowing riffs in the past, this case could have wider implications. It also brings up an interesting set of questions for young music listeners: Who is Jimmy Page? Where is the Stairway to Heaven? And what is plagiarism?

+ How much has the music business changed since this song was released? Stairway has pulled in “$562 million in publishing royalties and record sales since its release.” Does anyone remember royalties?

+ Join Stephen Colbert and judge for yourself.