Answer by taking a quote from the following article:

Flotsam and Jetsam is an American thrash metal and progressive metal band that formed in Phoenix, Arizona in 1981. The band currently consists of vocalist Eric A. Knutson, guitarists Michael Gilbert and Steve Conley, bassist Michael Spencer and drummer Ken Mary. Flotsam and Jetsam went through several lineup changes over the years, and Knutson has been the only constant member of the band. They are also notable for featuring bassist Jason Newsted, who left the band shortly after the release of their debut album to join Metallica as Cliff Burton's replacement.

In June 2013 the band headlined at the Warriors of Metal Festival in Columbus Ohio, then returning home, Flotsam hired manager Jeff Keller(JKM). His roster includes the likes of: UDO, Destruction, Lordi, Hirax, Primal Fear, Satan, Suicidal Angels.  In 2006 after the successful remix and master of the debut album "Doomsday for the Deceiver", there was a lot of fan requests to have "No Place for Disgrace" follow the same process. After spending some time at the 25 year mark, the band decided to go forward with this idea. The band had some issues with the original production and definition of some of the parts played, due to the speed it was recorded at. Having had success with Ugly Noise through the PledgeMusic process, the band would be able to again gain the rights to this classic with a re-recording and some minor changes.  In the middle of 2013 Flotsam embarked in this monumental task of reviving some songs that for the most part hadn't been played in 20 years. All tracks (except drums) were done at the Flotsam studio with Michael Gilbert at the helm. In December the project was finished and the re-recording of the classic album "No Place For Disgrace", was again released using PledgeMusic to finance the project.  The album, No Place For Disgrace 2014, was set to release on Feb 14th, 2014 worldwide through Metal Blade Records distribution. NPFD 2014 would feature some of Flotsam's friends from the past as guest musicians, Mark Simpson, Chris Poland, Tory Edwards.  Flotsam is currently ramping up for their (29 show) European tour with Sepultura, Legion of the Damned and Mortillery. The tour kicks off on Feb 7th in Bochum, Germany.

Who was the lead vocalist at the concert ?
Michael