The "classic" lineup from 2006 to 2009 included the Sjunnessons with Roland Johansson (clean vocals), Karin Axelsson (bass) and John Bengtsson (drums).

Today, the band consists of Robin (now the only original member) alongside British singer Nathan J. Biggs and bass player Michel Bärzén.

Before Sonic Syndicate, brothers Richard and Roger and their cousin Robin Sjunnesson played in a heavy metal-oriented band called Tunes of Silence, which was formed in 2000, in their teens.

[9] Bassist Karin Axelsson replaced Svensson in 2004 before the band changed its name to Sonic Syndicate and released its debut studio album, Eden Fire.

In early February 2006, during their tour with Avatar, both drummer Kristoffer Bäcklund and keyboardist Andreas Mårtensson were asked to leave the band due to lack of interest and musical differences.

[13][14] In November 2006, they entered Black Lounge Studios to record their follow-up to Eden Fire with Jonas Kjellgren of Scar Symmetry.

The singers of Sonic Syndicate, Richard Sjunnesson and Roland Johansson, also sang for a compilation album, called Nuclear Blast All-Stars: Out of the Dark with Soilwork guitarist Peter Wichers.

At the end of the year, the band toured Germany and Scandinavia, and released the singles "Power Shift" and "Contradiction" directed by Marius Böttcher of Quent Film.

[26] On 13 October, Roland Johansson expounded in an interview that his reason for leaving Sonic Syndicate was that he felt severe anxiety and dislike for the lifestyle that went with having to tour all around the world and not being able to spend much time with his loved ones.

He also shared that he and Jesper Strömblad (formerly of In Flames) are currently working on an unnamed project, and would start recording an album in the beginning of 2010 (although, as of April 2011, there has still been no sign of any material from the two).

[27] On 24 August 2009, British vocalist Nathan James Biggs (formerly of The Hollow Earth Theory) was announced as Roland Johansson's replacement.

On 25 September, Sonic Syndicate released their debut single with Nathan entitled "Burn This City" and its music video.

Work on the pre-production of a new album begun on 3 January 2010 under producer Toby Wright, recorded at Bohus Sound Studios in Kungälv, Sweden.

On 3 June, Sonic Syndicate traveled to Gothenburg, Sweden and began shooting the music video for the second single "My Own Life" with Patric Ullaeus of Revolver Film Company.

[35][36] On 29 September, the video was released, but it was banned on most websites due to its graphic content (including female nudity), and it also resulted in the deletion of their Facebook page (although they created a new one in late 2011).

Christoffer Andersson (of What Tomorrow Brings) filled in the remaining tour dates for Richard but did not become his permanent replacement due to other commitments.

[39] Richard went on to form The Unguided with other former Sonic Syndicate members and also joined melodic death metal band Faithful Darkness for a brief period.

Fallen Angels' demos contained no clean vocals at all and had a similar sound to early melodic death metal bands such as Dark Tranquillity and In Flames.

Love and Other Disasters featured less "flashy" synths (mostly strings) and mostly slower songs than before and was commercially more successful than Only Inhuman and Eden Fire.

Robin and Roland together wrote the music to about five songs on Love and Other Disasters, with the rest by Roger and all the lyrics as normal were written by Richard.

Burn This City and We Rule The Night, however, featured a second lyricist (new singer Nathan J. Biggs) as well as Robin now composing half the music for Sonic Syndicate.