A rep for Santana tells us the 75-year-old was over-taken by heat exhaustion and dehydration, leading to the medical episode. He was taken to a local hospital for continued observation, but his rep says he's, "doing well."

A scary moment for Carlos Santana and his fans, as the legendary musician collapsed onstage during one of his concerts.

Santana was performing at Pine Knob Music Theater, outside Detroit, Tuesday night, when a concertgoer tells us the medical emergency happened. We're told Santana was bout 4 or 5 songs into his set, and started to sing a song called "Joy."

Realizing something was wrong, we're told Santana sat down in front of the drums, and then collapsed backward. From there, a bunch of staffers, including EMTs rushed to his aid.

You can see in video from the show, a black tarp was brought out in order to shield Santana while officials were working on him.

Twitter Tweet Unavailable

Thankfully, Santana came back around, and was seen waving to the crowd as he was wheeled off the stage.

It's currently unclear what caused Carlos to collapse, but it appears he was taken to the hospital for further evaluation.