UMUR "Euthanasia" is the first demo cassette tape released by Swedish death metal act Edge of Sanity. The demo was self-released in November 1989. The tape was released with three different artwork colour variations. One with a black/white cover, one with a red/black cover, and one with a blue/black cover.

"Euthanasia" features 5 tracks and a full playing time of 10:52 minutes. "Return of Consciousness" is a short intro, but the remaining four tracks are "regular" death metal tracks. This is of course early death metal and therefore there are strong thrash metal leanings in the music too. Many of the riffs and rhythms are more in the thrash metal camp than in the death metal ditto. Dan Swanö´s vocals are death metal growls though. The intro, "Pernicious Anguish" and "Disrupting the Inhabitants" are exclusive to this release, while "Human Aberration" would appear in a re-recorded version on the band´s debut full-length studio album "Nothing but Death Remains (1991)", and "Incipience to the Butchery" would be featured in a re-recorded version on the band´s second full-length "Unorthodox (1992)".

The musicianship is decent for a first demo, but not everything is played as tight as it could have been. Swanö had not yet developed his disctinct sounding intelligible growling vocal style either, so his vocals here are more standard unintelligible growling. The material is overall of a relatively good quality and especially the two tracks which made it unto studio albums display that even this early on Edge of Sanity had some pretty unconventional ideas, although in small doses on this release.

The sound production is raw and lo-fi, but the band have gotten the most out of the recording equipment they had at their disposal, and "Euthanasia" is generally listenable. Upon conclusion "Euthanasia" is certainly a promising first demo by Edge of Sanity and considering the time of release, the music is quite advanced for a death metal demo. A 3 star (60%) rating is warranted.