There are more bands using this name:

1) State of Serenity. With complex grooves, technical breakdowns, graceful leads and suave melodies, all contained with sincere atmosphere and ambience.

State of Serenity - Instrumental progressive metalcore from the UK, have set out to make this their reality.

https://www.facebook.com/stateofserenityband
http://stateofserenity.bandcamp.com/album/foundations

2) State Of Serenity (also known as SOS) are a 5 piece band from Birmingham UK with members; Matty H (guitar / vocals); Alex Baker (vocals); Alex Lee (drums); Marc Perkins (bass); and Pete Styles (guitar). Their fusion of emotional passion and brutal guitar work mixed with immense live shows has left them labelled as one of Birmingham’s strongest underground, unsigned metal acts.

SOS was created in February 2002 under the name Innate, when Matty H and two friends (Rob Leaman - a friend from Birmingham University and Ryan Slaughter - a drinking mate) formed the band: originally with drummer, guitarist, bass player, but no singer. A few weeks into the band’s life, Rob (drums) introduced a course-mate along to the studio to try vocals, and Alex Baker became the vocalist for good. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.