Sub Arturo plebs
... that the medieval motet Sub Arturo plebs has the name of its composer along with those of 14 fellow musicians, plus instructions on how to perform the piece, written into its own lyrics?
... that the medieval <a href="./Motet" id="mwEm8" rel="mw:WikiLink" title="Motet">motet</a> <i id="mwEnA"><b id="mwEnE"><a href="./Sub_Arturo_plebs" id="mwEnI" rel="mw:WikiLink" title="Sub Arturo plebs">Sub Arturo plebs</a></b></i> has the name of its composer along with those of 14 fellow musicians, plus instructions on how to perform the piece, written into its own lyrics?