Jason Aldean explains from his advantage point of the Las Vegas attack.

Back in Sunday October 1st 2017 10:06 PM Jason Aldean was onstage just performing one last song to the audience which the song was When She Says Baby he was singing the first verse of the song when he heard the gunfire occurring he sung Some days it's tough just gettin' up Throwin' on these boots and makin' that climb Some days I'd rather be a no-

But couldn't finish when he ran to the side of the stage.

Then after he posted this on Instagram saying

Tonight has been beyond horrific. My thoughts and prayers go out to everyone involved tonight. It hurts my heart that this would happen to anyone who was just coming out to enjoy what should have been a fun night.

Jason Aldean explains what he thought and how it happened.
It was crazy! I was on stage and our ear monitors that we wear when we are onstage, The sound sounded like a speaker or guitar amp crapping out and I didn't know what it was. But it took me a while to figure it out when we were offstage, My guitar player ran behind me and told me let's get out of here and my security guy was on stage telling me to go with him and telling me to run. So we got to the side of the stage and that's kinda when I realized what was going on I pulled my ear monitors out and he told me what was going on. Nobody knew what was happening that was the thing everybody was looking around. That's the last thing you think is gonna be happening during a show. Everybody was just stunned and really did not know what to do, what was going on or anything. My wife was there too!

The 22,000 Concert Goers POV
They thought that the gunfire was the end of the show fireworks and that gave them an unsuspected moment for a lot longer and let the shooter continue to kill folks.