Rod Stewart stops concert to use oxygen tank.

As shown in a video obtained by TMZ, the 81-year-old could be seen doubling over during his concert in Utah on Saturday night, and grabbing onto surrounding instruments to stay upright as he finished the song. He then waited for staff to bring an oxygen tank to the side of the stage and took a few deep breaths from it before returning and addressing the crowd. "The show must go on," he said, as he informed them that he "nearly f--king fainted" and tried to do a little dance.