Would we say that since most people cannot sing in tune, it must be right to sing out of tune?

Like most things - it is not a matter of right or wrong - it is a matter of taste. What may sound out of tune to western ears may sound very tuneful to Polynesian ears.

So it is not that you can't sing in tune - it is just that you are living in the wrong place. *Smiles*

To be a little more serious. I think it is the same with music as with language. The ability and ease of travel means that these things are changing faster and faster.

The 60s song that Pete and Dud tried to make sense of bears no comparison with the current words used in the songs of rappers and hip hop and in their everyday language.

It may be conforting for some to think that both language and music are governed and contolled by some set of unchanging rules that can be taught - but the reality is that they are not.