Music by Kevin MacLeod. Available under the Creative Commons Attribution 3.0 Unported license. Download link: http://incompetech.com/music/royalty-free/mp3-royaltyfree/Modern%20Piano%20Alpha%20-%20As%20Loud%20as%20Possible.mp3

MacLeod's description:

Genre: Modern
Length: 1:08
Instruments: Piano

Very loud and very discordant. Uses halves of the piano alternately. The first of a series. 009
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ISRC: US-UAN-11-00152
Aggressive, Unnerving, 2006