What Continuity Jones said. People get the process mixed up with the label/genre. ANY song is a candidate. Mg's are gonna wind up getting in, I'm sure. We sing a bunch now. But we're back to "what is folk" again and we're supposed to be arguing about something else. Or maybe we aren't, and it's just that some singer-songwriters will write songs that end up being folk, but aren't yet, and others will write country and rock hits or other-than=English songs that we may never hear.

But singer-songwriter is what someone does, not the genre of music they writesing (I just made up a verb--can I writecopy it?).