Illuminatus
- Official website for the UK post-metal band Illuminatus: tour dates, news, lyrics, downloads, biography.
- http://www.illuminatus.biz

Ipnos Asteri
- Original classical compositions mixed with improvisation and experimental sounds, which they call "Classical Psychedelic". In Italian and English.
- http://www.ipnosasteri.net/

Inman, John
- Contains soundclips, biography, photos, reviews, and MP3s from current CD, as well as new material from this progressive/fusion guitarist.
- http://johninman.nstemp.com/

Irrational Exuberance
- An alternative/progressive rock project. News, biographies, and audio samples.
- http://www.spinjen.com/

Ice Age
- US progressive hard rock band, news, lyrics, images, audio, video and merchandise.
- http://www.ice-age.com/

Iluvatar
- US band, site includes news, an FAQ, biography, discography, show dates and merchandise.
- http://www.iluvatar.com/

Ion Vein
- Chicago progressive rock band. Includes biographies, reviews, photos, sound clips, and CD information.
- http://www.ionvein.com/

Isildurs Bane
- Official site for the Swedish band, news, biography, articles, tour dates and merchandise.
- http://www.isildursbane.se/