Who composed this song? should also be accepted
Agree! That is what I would say for this one.
Who wrote this song? should be accepted
Would "Who wrote this song?" ever be accepted? It just seems to be such a logical translation.
"Who is the person who wrote this song?" is now accepted. (16/04/2020)
~Vir pius sacrificat~
How about "Who composed this song?".
"who is the composer of this song", why not?
Who is the writer of this song does not pass muster?
doesn't "who is the writer of this song" say the same thing?