[Rain Man]

It's the honor system. Make your guess and then check out the number from this article about the Taurus lawsuit: http://money.cnn.com/2016/06/15/medi...ial/index.html

Spoiler!

Condé Nast Portfolio estimated in 2008 that "Stairway to Heaven" had earned more than $562 million in publishing royalties and record sales since it's 1971 release.

And recognize that that number is nine years old. The song was released in 1971, so $562 million only covers 37 years of its 45 year history.