In a self-explanatory post titled “Dear fellow-songwriters-pitching-me-songs-for-Adele-to-sing,” Minnesotan songwriter Dan Wilson, now based in L.A., is filing an open letter politely requesting that aspiring songwriters stop asking him how they can get their work to Adele. Wilson was one of the more visible helping hands behind Adele’s Grammys sweep last month; in addition to being…