There are several artists named Mourn:
1) A post-punk band from Spain.
2) A doom metal band from London, UK.
3) A sludge band from Los Angeles, California.
4) A metalcore band from Cardiff, Wales.
5) A screamo band from Italy.

1) Mourn is a quartet from Maresme, Barcelona, formed by Carla Pérez Vas, Jazz Rodríguez Bueno, Leia Rodríguez and Antonio Postius. They were signed to Captured Tracks in 2014 after they uploaded a live studio recording of Your Brain is Made of Candy. The 10 track debut LP, 'Mourn', was recorded live in the studio in two sessions and released in late 2014 (digital) and February 2015 (physical). It features Otitis and Silver Gold. Their second LP, 'Ha, Ha, He.', was released on June 2016 also via Captured Tracks. it includes Evil dead, Storyteller and Second Sager.
http://www.capturedtracks.com/#!mourn/zwrbj

2) Mourn is a traditional doom metal band from London, UK, fronted by Caroline Wilson. They released the demo "For Evermore" in 1993, and their debut album "Mourn" in 1995 through the label Rise Above.

3) Mourn is a sludge / blackened doom metal band from Los Angeles, California, United States.
https://mourn.bandcamp.com

4) A metalcore band from Cardiff, Wales, UK. Their debut EP, "The Next Life", was released in September 2021.

5) Italian screamo / post-hardcore band from Mantova / Modena / Reggio Emilia, formed in the mid '90s by members of By All Means and Mindless Collision. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.