What is a song?

I want to know how you define “song.” Do you consider YouTube wonders like “Bed Intruders” songs? If not, what’s it missing? What are the crucial elements to any song?

You can be as abstract as you like. For example, you might define a song as a “short burst of entertainment.”

I am also interested in your age, your experience with music, how you’ve seen music morph in time, and where you think music is headed. What will music look like in 1, 5, 10, 20 years? Who will own the rights to music? How will artists get paid?