For this reason movies often use different songs (which are not in copyright or are owned by the studio) for birthday scenes. AOL Time Warner earns over $2 million per year from royalties for the song.
Another reason that greed is the cancer of humanity. Not cancer - cancer is the cancer of biology. This is worse, and I don’t care if I sound crass in saying it. Not this fact specifically, but the fact that it can happen, that a price tag can be affixed to a song like this. No no.