For me, fiction isn't very cathartic. It can be a broad, long catharsis, but it's a whole different thing - whereas music is physical. Essentially, it goes in through your ear. Fiction is cerebral, necessarily. It can do emotional stuff. But they don't really compare - not for me.
John Darnielle is an American musician and novelist best known as the primary (and often solitary) member of the American band the Mountain Goats, for which he is the writer, composer, guitarist, pianist, and vocalist.