There are more than one band using the name Portal:

A death metal band hailing from Australia, partially comprised of members of fellow death metal band Stargazer, who have released 2 albums—Seepia, and most recently Outre—plus one EP—The Sweyy—to date. Highly technical with drumming and general style reminiscent of latter-day Morbid Angel, Portal has avery fast and have also released on EP entitled The Sweyy.

Portal (Aus), Death/Black Metal - http://www.portalabode.com/

An independent progressive rock band from Edmonton, Canada (http://www.portalband.com/)

An atmospheric prog-metal band created by members of Cynic. They only released a demo in 1995.
http://www.cynicalsphere.com/portal.html)


www.portal-music.com

The UK based musical pioneers "Portal" create music that could be best described as blissed-out ambient lush noise and experimentation, yet Portal still manages to maintain and create a strong sense of melody and structure.

Portal have received much praise for their sonic landscapes and received great reviews from publications such as The Guardian and DJ Magazine.

Portal is also the name of an ambient-electronic band.

www.myspace.com/portalsounds

Portal is also a popular video game released on Steam with a Credit song to blow away all others. The ending credits song, titled "Still Alive", was sung by Ellen McLain and written by Jonathan Coulton.