ranked as the number-one song
... that the song "Need You Now", performed by Lady Antebellum, ranked as the number-one song on the U.S. Adult Contemporary chart on the Billboard 2010 year-end list?
... that the song "<a href="./Need_You_Now_(Lady_Antebellum_song)" id="mwAbc" rel="mw:WikiLink" title="Need You Now (Lady Antebellum song)">Need You Now</a>", performed by <a class="mw-redirect" href="./Lady_Antebellum" id="mwAbg" rel="mw:WikiLink" title="Lady Antebellum">Lady Antebellum</a>, <b id="mwAbk"><a class="mw-redirect" href="./List_of_number-one_adult_contemporary_singles_of_2010_(U.S.)" id="mwAbo" rel="mw:WikiLink" title="List of number-one adult contemporary singles of 2010 (U.S.)">ranked as the number-one song</a></b> on the U.S. <a href="./Adult_Contemporary_(chart)" id="mwAbs" rel="mw:WikiLink" title="Adult Contemporary (chart)">Adult Contemporary chart</a> on the <i id="mwAbw"><a href="./Billboard_(magazine)" id="mwAb0" rel="mw:WikiLink" title="Billboard (magazine)">Billboard</a></i> 2010 year-end list?