I wouldn't hesitate. We take to DS to concerts all the time, have since he was a few months old, and have never had an issue. No I wouldn't take him to certain acts, into a mosh pit, something like Britney Spears/Madonna with raunchiness, etc. but he's been to see Counting Crows, Live, Matchbox 20, Justin Timberlake, etc. with no problems. We're actually taking him to Elton John/Billy Joel tonight. (Yay!) Can't imagine any wildness there.

Taylor Swift would also be totally fine. We do insist that he wear
safety ear muffs. I can't imagine him possible getting lost. We carry him when we're not seated.
When he was little he just nursed, and slept in the sling. Now that he is older he really enjoys the music.