for two trumpets
... that the only trumpet concerto by Antonio Vivaldi is for two trumpets?
... that the only <a href="./Trumpet_concerto" id="mwBnY" rel="mw:WikiLink" title="Trumpet concerto">trumpet concerto</a> by <a href="./Antonio_Vivaldi" id="mwBnc" rel="mw:WikiLink" title="Antonio Vivaldi">Antonio Vivaldi</a> is <b id="mwBng"><a href="./Concerto_for_Two_Trumpets_(Vivaldi)" id="mwBnk" rel="mw:WikiLink" title="Concerto for Two Trumpets (Vivaldi)">for two trumpets</a></b>?