In field 1, use "OP25" for Opp.1-25, "OP50" for Opp.26-50, "VO" for vocal and choral works w/o opus, "IW" for instrumental works w/o opus, and "AR" for arrangements, each followed by the item number (field 2). Field 1 defaults to the setting for Opp.1-25. Field 3 defaults to "Schoenberg Center".
