Musically SIRIUS offer a surprisingly mature sounding mixture of cold, Nordic Black Metal and flattering, warm keyboards, which are quite close to the above-mentioned bands, but without copying them.

Just a little more variety would have done the album good, because apart from the two keyboards-tracks "The Stargate" and "Beyond The Scarlet Horizon", which both are very symphonic, the Metal-songs are a bit too similar in their structure and sound. But compositions like the opening "Sidereal Mirror" or "Ethereal Flames Of Chaos" clearly indicate the potential of the Lusitans.

Fans of EMPEROR and LIMBONIC ART, or those that want to become those, will surely like SIRIUS, especially as the production is very clear and powerful.