Guitarist, composer and bandleader Roeland Celis refuses to allow convention to restrict the flow of his adventurous creativity as he channels his diverse musicality into the unique ecosystem that he"s called Ping OD. and its debut release The Vacuum. Celis has gathered an all-star crew of musicians from the fertile scene in his native Belgium to join him on his sonic adventure into a land where the dynamics and freedom of improvisation can meet the power and intensity of progressive metal and the exciting rigor of twelve-tone theory.