chris stapleton is a songwriter
however record producers can be involved in cowriting songs as the composer wearing two hats as the producer and songwriter as they may write and compose the original music such as the beat and then oversee the production that takes control of the recording sessions with the artist and engineer all the way down to the mix stage
 song pitching can be done on a songwriters behalf by their publisher or independently using tip sheets like rowfax the musicrow publication and songquarters