Important Music Question

At what point does a 'good song' become a 'tune'? Sorry, a tuuuuuuuuune. The ridiculous amount of emphasis on the u is important.

As I listen to the radio a lot more now, simply because I have it on in the car both on the way to and from work, I hear a lot more music. My station of choice, which I won't satisfy by giving a mention, plays a lot of random music and a lot of cracking songs (or, if you prefer, tuuuuunes) from various eras without real distinction. This evening I have gotten into my head as a result of my drive home both They Might Be Giants' Birdhouse in your Soul and the curiously named Smash Mouth's All Star.

Nothing wrong with that.