OSI (band) - Musical Style

Musical Style

Moore has described OSI's sound as "a new approach to progressive rock", combining elements of progressive metal and electronica. Moore considers the two genres to be "almost natural enemies", and that the conflict between the two genres "keeps interesting". Matheos cites progressive rock and heavy metal bands such as Genesis, Jethro Tull, Black Sabbath and UFO as influences. Moore described his influences as minimal techno, experimental, electronic musicians and "bands that play live and then chop it up".

Matheos and Moore primarily work alone, exchanging files and ideas by email. The writing process for all OSI's albums has been the same, with Matheos sending Moore an idea "from just a guitar riff to elaborate, almost completed songs", which Moore then edits and sends back to Matheos. Moore, the band's vocalist and lyricist, has described the process of writing lyrics as an "audio Rorschach test". The lyrics on Office of Strategic Influence feature political themes, but the lyrics on later releases are less political, instead being based on Moore's personal experiences. "I'll start writing a song that has a little bit of a world view or political view or something," he said, "but then by the time I'm finished the lyrics it'll be about a relationship or something like that." On Blood, Moore largely abandoned his earlier stream-of-consciousness approach to writing lyrics, in an attempt to make the lyrics more coherent. "I didn't want it to be like 'Oh, you get your own impression of the lyrics. Everybody has their own idea!' I wanted to have an idea that I wanted to communicate, and something communicable," he explained.

Moore has acknowledged the narrow range of his vocals. He considers his vocal style to " from how I feel when I’m singing, when I'm in the zone of writing lyrics and recording which, a lot of times, comes as the same time. It's sort of an introspective time. A lot of the material lends itself to that kind of voice and that kind of spirit."