Martha Lipton
... that mezzo-soprano opera singer Martha Lipton performed 401 times at the Metropolitan Opera?
... that <a href="./Mezzo-soprano" id="mwFvI" rel="mw:WikiLink" title="Mezzo-soprano">mezzo-soprano</a> <a href="./Opera" id="mwFvM" rel="mw:WikiLink" title="Opera">opera</a> singer <b id="mwFvQ"><a href="./Martha_Lipton" id="mwFvU" rel="mw:WikiLink" title="Martha Lipton">Martha Lipton</a></b> performed <a href="./List_of_performers_at_the_Metropolitan_Opera" id="mwFvY" rel="mw:WikiLink" title="List of performers at the Metropolitan Opera">401 times</a> at the <a href="./Metropolitan_Opera" id="mwFvc" rel="mw:WikiLink" title="Metropolitan Opera">Metropolitan Opera</a>?