Artists like OSI

Lunatic Soul is a progressive rock side-project founded by Riverside vocalist and bass guitarist Mariusz Duda in 2008. Originally conceived to allow him to explore genres outside of rock, the project was described by Duda in 2014 as progressive, ambient, oriental, and electronic. Lunatic Soul has released eight albums to date. The most recent, The World Under Unsun, came out in October 2025.

Soen is a Swedish progressive metal band formed in 2010. The group consists of vocalist Joel Ekelöf, guitarist Cody Lee Ford, bassist Stefan Stenberg, drummer Martin Lopez and keyboardist Lars Åhlund. They are currently signed to Silver Lining and have released seven studio albums. Their most recent studio album, Reliance, was released on 16 January 2026.

Haken are an English progressive metal band formed in 2007 by multi-instrumentalist Richard Henshall, guitarist Matthew Marshall, and vocalist Ross Jennings. While Henshall, Marshall, and Jennings first had the idea of forming Haken in 2004, they opted to pursue their instruments and songwriting first. Upon recruiting other members three years later, they eventually released the demo Enter the 5th Dimension in 2008, signing with Sensory Records and releasing their first album, Aquarius, in 2010. As of 2026, they have released seven studio albums, two EPs, and two live albums.

Caligula's Horse is an Australian progressive metal band from Brisbane, Queensland. The band was formed by Sam Vallen and Jim Grey in early 2011. The current lineup consists of lead vocalist Jim Grey, lead guitarist Sam Vallen, bassist Dale Prinsse and drummer Josh Griffin. Caligula's Horse achieved their first chart success with their 2015 album release Bloom, with it reaching number 16 on the Australian Albums ARIA Chart and number 75 on the overall album chart. The album also reached number 73 on the Australian iTunes chart on 21 October 2015.

Ayreon is a musical project by Dutch songwriter, singer, musician and record producer Arjen Anthony Lucassen. Ayreon's music is described as progressive rock, progressive metal and power metal sometimes combined with genres such as folk, electronica, experimental and classical music. The majority of Ayreon's albums are dubbed "rock operas" because the albums contain complex storylines featuring a host of characters, usually with each one being represented by a unique vocalist.

Threshold are an English progressive metal band formed in Surrey in the late 1980s. The guitarist and producer Karl Groom has been the band's only consistent member.