O.S.I.

The word "supergroup" has often been used to describe O.S.I., one of the best-known progressive metal/progressive rock acts to emerge in the United States in the 2000s -- and considering who has been leading O.S.I., that word is not an exaggeration. The leaders of O.S.I. have included guitarist/keyboardist Jim Matheos and lead singer/keyboardist Kevin Moore, both of whom bring strong prog and metal credentials to the table. Moore is a former member of Dream Theater (one of the top progressive metal bands of the 1990s and 2000s) and the founder of Chroma Key (whose work is prog...