Biography
There are two bands with this name.
1) Asperity is a heavy metal band from Sala, Sweden.
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Their line up is:
Petri Kuusisto - guitar
Stefan Westerberg - drums
Peter Kronberg - vocals and bass
Johan Jahlonen - guitar
They have released one album in 2004 entitled The Final Demand.
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2) Asperity was a post-hardcore band from Peoria, Arizona, United States.
Peoria-based pummelcore band (think: Underoath) stomps through five songs of lacerating riffage and throat-tearing screams along with melodic singing on their 2006 EP, Writing The Pages. Asperity started off like every other high school band rehearsing, playing shows, and posting some demos on Myspace.
Asperity has had the privilige of sharing the stage with such bands as Greely Estates, A Change Of Pace, Blessthefall, The Cover Up, Alesana, Eyes Set To Kill, Four Letter Lie, Catherine and The Human Abstract just to name a few.
Biography text from Last.fm, available under CC BY-SA.