Not Ferneyhough, but Richard Barrett, wanted his music to be "illuminating."
To make music out of disembodied abstractions might be a very inter-
esting exercise for a composer to indulge in, but why should anyone
want to listen to it? What has it got to say to them? What has it in
common, if you like, with the listener that is going to be productive of
some kind of empathy - I hesitate to say 'communication', because
then we begin to get into linguistics, and that's a huge grey area as far
as music is concerned... I think the important thing for me in that
respect is that music such as this, which I suppose is 'visionary', 'con-
fessional' and all those things, has a function, which is to be productive
of what we might call illumination of various sorts in a listener. ( Interview with Richard Toop in Contact, no. 32 (Spring 1988))