Warren Zevon may or may not be playing the harmonica

Warren Zevon may or may not be playing the harmonica at this moment at the House of Blues in Las Vegas. At first we thought he was definitely blowing, but then we saw that there's a space between his open mouth and the harmonica. So maybe he's singing? Or maybe he IS playing, just taking a breath. We don't know for sure. This photo was taken, in any case, on March 25, 2000.