Nocturnus

Nocturnus was an American progressive death metal band formed in Tampa, Florida in 1987 by drummer/vocalist Mike Browning (formerly of Morbid Angel). They were known for their science-fiction themed lyrics and use of keyboards, both of which were virtually unknown in extreme metal at the time. Although they were (and still are) relatively obscure, notable bands such as Necrophagist and Theory in Practice have cited Nocturnus as an influence.