This week the show previews this weekend's happenings at PS21 in Chatham with Judy Grunberg (interviewed by Ellen Thurston and Tom DiPietro), plus performances Friday night by Mamadou Kelly (interviewed by Neva Wartell), and Monday night by Sidi Toure at the Half Moon in Hudson. "Hudson Valley Sound" presents local music and poetry, with live performances, interviews, and songs from albums. Sometimes the show will be live, and it could come from any location including musician's rehearsal spaces, local stages, or any WGXC studio. Send material for inclusion to Wave Farm, 5662 Route 23, Acra, NY 12405.