There are multiple artists with the name Observer:

1. OBSERVER. A sextet from Moscow, formed in 2018, playing heavy atmospheric music inspired by sci-fi books and movies like «Blade Runner» or «Neuromancer». The band is also inspired by classic post-metal/post-rock bands like ISIS and Godspeed You! Black Emperor, as well as avant-garde composers like Steve Reich and Alvin Lucier. This is something that a program won't tell you and a machine won't understand.

2. Observer (formerly Azimuth Zenith) is a Progressive metal band based out of Dallas, Texas. Their debut album features a wide variety of styles from math rock to thall.

3. A Deathcore band from the US.
https://www.facebook.com/observermetal

4. A Black Metal Band from Brazil
http://thetrueobserver.bandcamp.com/album/observer-2

5. Winston Holness, better known as the Observer or Niney the Observer (born George Boswell, 1951, Montego Bay), is a Jamaican record producer and singer who was a key figure in the creation of many classic reggae recordings dating from the 1970s and early 1980s. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.