@William said:
Obviously you need more than pure ideas, since art is about communication of ideas, not simply the formulation of them.
Exactly, and that´s why I think you need a composer AND a performer, they depend on each other. A composer without a performer is nothing. If you do that yourself, fine, but you´re simply taking over this other job.
Performers overpowering the composer is simply bad taste and a disgusting egoistical attitude, but I don´t feel that question brings us closer to an answer, what music is.
And, besides that, there are also performing composers out there which, as performers, overpower their composing part. But that´s because the composer part is so weak... [:D]