Mark Abrahamian, a guitarist for the band Starship, passed away following a concert last night in Utah ... TMZ has learned.

The band tweeted, "We are shocked and saddened at the sudden loss of our guitar player Mark Abrahamian. We will miss you, brother. Rest in peace, Mark."

Abrahamian has been on tour with Starship starring Mickey Thomas since 2000. He has also played with the likes of Survivor, Toto, Loverboy and ACDC.

The band was scheduled to play a concert tonight, but canceled the show.