A lot of organ music is written for specific types of organ and sometimes even specific organs in mind, and is barely playable on other organs.
Much other music is written for specific purposes, operas, oratorios, ballets, and so on. Plenty of composers have been commissioned to compose for specific events. Perhaps you will be too, one day

Despite that, as David was writing about a piece of organ music in the organ forum it is not unreasonable to suppose he was talking primarily about organ music.
Best wishes
barry
QUOTE(Scaramouche @ May 29 2007, 10:08 PM)

QUOTE(dcmbarton @ May 29 2007, 10:06 PM)

I know you say 'wherever the peformer wants it to be played', but most pieces are written an intended for a particular king of occasion.
Are you referring to organ pieces when you say this or any kind of music? I certainly do not compose my music with an occasion in mind.