We communicate with the most detail using words, but body language, facial expressions, touch and other scrubs act as girls of communication as well. All of these things have a common foundation in pattern.

What we call art is the manipulation of these common patterns. When it's most successful, it often regurgitates patterns that have proven successful. When it's most meaningful it modifies the old pattern to make new patterns that people can appreciate.

The question then becomes, how much modification can you engage in before your work because meaningless to everyone but yourself.

Imagine if your friend was a writer who got tired of the spoken languages and began writing novels in his own custom language. Would you lament the fact that no one reads his books?

Btw, I took a (very) brief listen to your friends music and it seemed kinda interesting, but I can certainly see why he lost all of his followers.