 
<translate> Don amsa wannan tambayar, ya kamata mu sani cewa: Sa'ad da aka fara harbin, mai rera waƙar ƙauye Jason Aldean yana ba da jawabinsa na ƙarshe a gaban masu sauraro kusan 22,000. To, amsar ita ce mawaki mai suna Jason Aldean. <eng> To answer this question, we should know that: When the shooting began, country music singer Jason Aldean was giving the closing performance in front of an audience of about 22,000.
So, the answer is country music singer Jason Aldean. 