I think more importantly than the particular genre of the music is the intent of the composer. Is the intent to glorify God, His church, and to bring man to Him; or is it to glorify Man and relegate God to second place?
...all accompanied music is somehow inferior to 'pure music', un-accompanied choral music. Well..."Danny Boy" was originally sung un-accompanied - does that make it and more sacred than a Mozart Mass?
I think that the Church has room, and has always had room for other styles of SACRED music. There have to be regulations, but not Puritanical Edicts. Lets have more Mediaeval Polyphony, lets have more Orchestral Masses, lets get together and commission a piece by Arvo Part, John Tavener, or Judith Bingham, and yes, lets have Gregorian Chant, and Classical Polyphony. (Lets burn the guitars and bongos.) But let us not get into Puritanical squabbles about styles and genres.
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