I don’t know how she does it. I never have.

Ann Wilson’s voice is a natural wonder, an act of God or the universe or magic beans. It’s high and powerful, solid yet emotive. It seems to rumble from her chest into the stratosphere, with an effortless wallop. I have no idea who she gets through one of Heart’s scale-scaling songs let alone a whole set of the vocally demanding, all-out belters she has to tackle every night, even when she’s completely healthy.

Last night at the Seminole Hard Rock, Ann Wilson had a cold.

And she killed it anyway. And I don’t know how she does it. I’m just glad she did.

One after one they came - “Barracuda.” “Crazy On You.” “Magic Man.” “Straight On.” There are other people on the stage, including sister Nancy and her mighty guitar, but when Ann Wilson is singing, it’s hard to take your eyes off her. She looked great, if just a little weary, as she was, as she said, not feeling the best. But that didn’t affect the energy of the show. The only thing that did was, at least in the beginning, an odd lineup of songs, with too many long tracks following each other that made it flow slightly slowly.

But for the most part, all the energy you needed was in that voice, or, at times, in Nancy’s, the primary instrument on the sweet, ethereal “These Dreams,” and on the harmony of the similarly sweet “Dog and Butterfly.” Even the softer numbers, like “Alone,” are powerful. The fact that they can be this good when their lead voice is not at 100 percent is admirable. Still not sure how she does it.

Before Heart, Shawn Colvin commanded the stage with just her guitar and her emotive pixie lilt. Criminally, the singer/songwriter and recent memoir writer held her set to about a half-hour - it was obvious that more than a few of those who got there earlier were there to see her, given the sing-along to classics like “Polaroids” and “Diamond In The Rough” (full confession - I would never have been able to channel the angst of my 20s and early 30s with Colvin as a soundtrack for all that heartbreak, and also as a kick in the head to stop being so darned drama-queeny. Shawn’s magic that way.) For those of you who have never seen her full set - do.