songs we've wrote

We have original songs recorded and posted on the internet (myspace & fuzz). Recently our drummer quit our band. The recordings have his drumming on them. We made the recordings in the drummer's basement with equipment that belonged to everyone in the band. If we keep these recordings posted on the internet do we have to display credit to him for each of the song's drums? We currently do not make money selling our music. He did not write the lyrics, guitar, or bass. He only played the drums. Thank you for your time!