There are two bands with this name.

1) Asperity is a heavy metal band from Sala, Sweden.

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) Conservative Christianity and post-hardcore scree may seem like the most disparate of extremes, but the post-screamo rock sextet Asperity has that juxtaposition beat. 5/6ths of its members are only juniors in high school, with an average age of 17, the Peoria-based pummelcore band (think: Underoath) stomps through five songs of lacerating riffage and throat-tearing screams along with melodic singing on its new 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 privaledge of sharing the stage with such bands as Greely Estates, A Change of Pace, Bless the Fall, The cover Up, Alesana, Eyes Set to Kill, Four Letter Lie, Catherine and The Human Abstract just to name a few!