Introspection (or internal perception) is the self-examination of one's conscious thoughts and feelings. In psychology, the process of introspection relies exclusively on the purposeful and rational self-observation of one's mental state; however, introspection is sometimes referenced in a spiritual context as the examination of one's soul. Introspection is closely related to the philosophical concept of human self-reflection, and is contrasted with external observation.

Introspection has been a subject of philosophical discussion for thousands of years. Plato is thought to have referenced introspection when he asked, "…why should we not calmly and patiently review our own thoughts, and thoroughly examine and see what these appearances in us really are?" While introspection is applicable to many facets of philosophical thought, it is perhaps best known for its role in epistemology. In this context, introspection is often compared with perception, reason, memory, and testimony as a source of knowledge.

Keep of Kalessin is an extreme metal band from Trondheim, Norway formed in 1993. The group's early lineup consisted of Ghash on vocals, Obsidian C. (the group founder) on guitars and keyboards, Warach on bass, and Vyl on drums. They released two albums under this lineup: Through Times of War in 1997, and Agnen: A Journey Through the Dark in 1999, before splitting up. Obsidian C. then toured with Satyricon, but revived the Keep of Kalessin name for a 2003 EP, Reclaim. In 2006 he reconstituted the group with a new lineup and released a third full-length, Armada). They toured with Behemoth and Dimmu Borgir early in 2008. Their fourth album Kolossus was released on June 6, 2008. They take their name from Ursula K. Le Guin's Earthsea series of books, where Kalessin is the name of the arch-dragon who is the bearer of the Earthsea world. Keep of Kalessin was nominated for a Spellemannprisen in the metal category in 2008.

Thijs Van Leer (pronounced: /tɛis vɑn lɪər/; born 31 March 1948) is a Dutch musician, singer and composer, best known for heading the Dutch progressive rock band, Focus, as primary vocalist, Hammond organ player, and flautist. He also yodels and whistles. In his later years, Van Leer went on to release many solo albums which were also classical music and jazz-based.

Van Leer was born in Amsterdam, and received his first flute at the age of eleven from his father, a classical flautist. He studied History of Art at Amsterdam University; after when he began studying flute and composition at the Amsterdam Conservatorium. He received a degree for flute from Geneva Conservatoire and also studied piano, orchestration (with Rogier van Otterloo) and organ (with Anthon van der Horst).

While still at school, van Leer led a jazz group on piano. He went on to play the flute and sing with the Shaffy cabaret group. In 1969 he joined Martijn Dresden (bass) and Hans Cleuver (drums) to form a trio that covered songs by Traffic and backed other Dutch musicians, as well as playing their own material. Later in the year guitarist Jan Akkerman joined, completing the initial line-up of Focus. They released several albums in the early 1970s.