four-hour concert
... that Ludwig van Beethoven once directed a four-hour concert that featured the public premières of his Symphony No. 5, Symphony No. 6, Piano Concerto No. 4 and Choral Fantasy?
... that <a href="./Ludwig_van_Beethoven" id="mwBUs" rel="mw:WikiLink" title="Ludwig van Beethoven">Ludwig van Beethoven</a> once directed a <b id="mwBUw"><a href="./Beethoven_concert_of_22_December_1808" id="mwBU0" rel="mw:WikiLink" title="Beethoven concert of 22 December 1808">four-hour concert</a></b> that featured the public premières of his <a href="./Symphony_No._5_(Beethoven)" id="mwBU4" rel="mw:WikiLink" title="Symphony No. 5 (Beethoven)">Symphony No. 5</a>, <a href="./Symphony_No._6_(Beethoven)" id="mwBU8" rel="mw:WikiLink" title="Symphony No. 6 (Beethoven)">Symphony No. 6</a>, <a href="./Piano_Concerto_No._4_(Beethoven)" id="mwBVA" rel="mw:WikiLink" title="Piano Concerto No. 4 (Beethoven)">Piano Concerto No. 4</a> and <a href="./Choral_Fantasy_(Beethoven)" id="mwBVE" rel="mw:WikiLink" title="Choral Fantasy (Beethoven)">Choral Fantasy</a>?