Chuck Comeau (Drums) and Pierre Bouvier (Lead Vocals) are the ones who write the songs.
all of their songs
Cody writes and co-writes all of his songs himself.
Pierre Bouvier (lead singer) and Chuck Comeau (drums) write the music
Simple Plan writes every single one of their songs. Both lyrics and the music.
Ruki writes the lyrics of the GazettE songs ;P
Blake Shelton typically writes his own songs.
Taylor actually writes her songs herself! She either wrote or co-wrote all of her songs. Sometimes Liz Rose writes her songs and Taylor co-writes.
People in their team write their songs but no one from mindless behavior writes their songs.
Chris writes his own music. (all of his songs in other words)
Yes, he writes and co-writes all his songs by himself.
Nobody, Eminem writes his own songs, he even writes his own freestyles!
Nickelback write their own songs.