It appears there is a confusion between the band "Nirvana" that achieved fame in the 1990s with Kurt Cobain as the lead singer, and an earlier UK-based band also named "Nirvana" that was active in the 1960s and 1970s. The releases you have listed correspond to the latter. Thus, I will provide a biography for the 60s band Nirvana.

Nirvana was a pioneering British psychedelic and progressive rock band formed in London in 1965. The core of the band centered around the songwriting partnership of Irish musician Patrick Campbell-Lyons and Greek composer Alex Spyropoulos. Though not attaining the massive mainstream success of their later namesake, this Nirvana has the distinction of being the first UK group to be signed to the Island Records label. Their music was characterized by baroque pop elements, orchestral arrangements, and evocative lyrical themes.

Their debut album, "The Story of Simon Simopath," released in 1967, is often considered one of the first narrative concept albums, pre-dating The Who's "Tommy" by two years. The single "Rainbow Chaser" from this album became an underground hit and is noted for its use of phasing. Over the course of their career, Nirvana went through numerous line-up changes but maintained their adventurous and experimental edge, as heard on works such as "All of Us" (1968), "Dedicated to Markos III" (also known as "Black Flower", 1970), and "Local Anaesthetic" (1971). Though never achieving major commercial success, Nirvana maintained a dedicated cult following throughout the years, and their records are now prized by collectors of early progressive and psychedelic rock.

Genres

Pop Rock

Folk Rock

Art Rock

Experimental Rock

Psychedelic Rock

Progressive Rock

Baroque Pop

Symphonic Rock

Acid Rock

Latest Release

Rainbow Chaser: The 60s Recordings (The Island Years)

Nirvana

Album - 52 Tracks - Released May 18, 2018