The Philosopher's Stone
... that Mozart wrote a cat duet for The Philosopher's Stone?
... that <a class="mw-redirect" href="./Mozart" id="mwCLE" rel="mw:WikiLink" title="Mozart">Mozart</a> wrote a cat duet for <i id="mwCLI"><b id="mwCLM"><a href="./Der_Stein_der_Weisen" id="mwCLQ" rel="mw:WikiLink" title="Der Stein der Weisen">The Philosopher's Stone</a></b></i>?