I’ve sung the piece the elegy piece by him that I believe was sung at the Diana funeral. It’s called Song for Athene, and it’s absolutely gorgeous. “May flights of angels lead the to thy rest, Alleluia.” One of the priests of the church I was attending saw us in front of the church with music that had the name of a greek god on it and started to have a problem with it until we assured him it was scriptural.
Oh, he’s a good composer, that’s not the problem. He may be a flake (and now a Muslim flake) in his personal life, but his music is beautiful. Normally, in fact, one might expect composers, artists, etc. to be a little on the unpredictable side, and doctrinal orthodoxy has never been demanded of the creator of works.
The fault lies with the Cathedral, which should not be permitting a piece that is perceived as being an Islamic work to be performed in the Cathedral. Judging from things that I have seen discussing this matter, even the Muslims (who of course have virtually no music, regard it as demonic and regard the Sufis as heretics) are thrilled by this because they regard it as Christianity somehow “bowing” to Islam. Incidentally, once Islamic prayers are said in a building, the Muslims regard it as their own. So I think this was an extremely foolish thing to do.