There was a good amount of metallic hardcore being churned out of the Northwest in the late 90s, but Mourn The Sun were one of the few bands that were really bringing elements of serious metal into the hardcore scene.
In late1998, their singer, Myron, left the band, and I believe moved to California. He was briefly replaced by Fenny Perez, who came out of San Jose, CA and the band Cathy Ames. Unfortunately, Mourn The Sun didn't last all that long. They called it a day after their bass player, Tyler Hook, passed away in, I believe, early1999.
In the download below is their 4 song demo tape from 1998, and a small collection of unreleased tracks. The first unreleased song was actually pre-demo and was intended to be part of a comp on Dead End Records. The other two unreleased tracks feature Fenny on vocals, and were recorded in late 1998 at the Art Institute in one take.
Mourn The Sun