Depends on the techniques that I'm trying to deliver. If I'm practicing power technique then something heavy, not particularly fast, Harvester of Sorrow by Metallica for instance. For fighting/sparring, well, Sepultura (Refuse/resist is a classic, as is it's remix), Slayer, especially anything off their Divine Intervention and Undisputed Attitude albums, Prodigy in general, quite a bit of Rammstein is useful too. In the end, anything that amplifies base emotions and reduces the need for thought, enabling you to flow without conscious effort is good. Problem being, if no one shuts off the music, you tend to just keep going, and either exhaust yourself (training) or do even more serious damage to the poor slob you've already beaten.
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In the end, we're all dead anyway.
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