There are at least 15 bands named Belial.

1. Belial is a Finnish death metal band active from 1991 to 1995. They released 2 albums, 2 EPs and 2 demos. In their earlier work they played a more traditional style of death metal with black metal influences. Later on they adopted more of a gothic rock / punk style.

The band consisted of:
Reima Kellokoski - Drums, Vocals
Jarno Koskinen - Vocals
Jarno Antilla - Guitar, Vocals
Jani Lehtosaari - Guitar, Bass, Vocals
Jukka Valppu - Guitar (on earlier releases)

2. Belial is a Rock/Hardcore band from Decatur, Alabama.
LP, EP, and one additional song up at http://belial256.bandcamp.com/

Cyrus Patel - Bass
Brady Lett - Vocals
Alex Powell - Drums
Jonathan Ransom - Guitar

3. Belial is a now defunct Thrash/Death metal band from Prague, Czech Republic. They released one demo, "Astragoth" in 1992. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.