voice crossing
...that though musicologist Knud Jeppesen wrote that without voice crossing "no real polyphony is possible," many counterpoint exercises prohibit it?
...that though <a class="mw-redirect" href="./Musicologist" id="mwCRE" rel="mw:WikiLink" title="Musicologist">musicologist</a> <a href="./Knud_Jeppesen" id="mwCRI" rel="mw:WikiLink" title="Knud Jeppesen">Knud Jeppesen</a> wrote that without <b id="mwCRM"><a href="./Voice_crossing" id="mwCRQ" rel="mw:WikiLink" title="Voice crossing">voice crossing</a></b> "no real <a href="./Polyphony" id="mwCRU" rel="mw:WikiLink" title="Polyphony">polyphony</a> is possible," many <a href="./Counterpoint" id="mwCRY" rel="mw:WikiLink" title="Counterpoint">counterpoint</a> exercises prohibit it?