Nota
... that Puerto Rican a capella group Nota sang together for 15 years prior to winning The Sing-Off?
... that <a href="./Music_of_Puerto_Rico" id="mwASY" rel="mw:WikiLink" title="Music of Puerto Rico">Puerto Rican</a> <a class="mw-redirect" href="./A_capella" id="mwASc" rel="mw:WikiLink" title="A capella">a capella</a> group <b id="mwASg"><a href="./Nota_(group)" id="mwASk" rel="mw:WikiLink" title="Nota (group)">Nota</a></b> sang together for 15 years prior to winning <i id="mwASo"><a href="./The_Sing-Off" id="mwASs" rel="mw:WikiLink" title="The Sing-Off">The Sing-Off</a></i>?