Upbeat Instrumentals for Work & Study

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Classical to Electronic, World Beat Percussion to Spanish Guitar, good structured instrumental music for studying or focusing on work (with a little Jazz thrown in for good measure). The changes in genre may be jarring to some people, but I find it helps me stay more alert while programming to switch things up every once in a while.

Note: I'll thumbs-down anything with lyrics even if I like the song (unless it's non-distracting repetitive rhythmic lyrics or non-english that sounds instrumental to me). I'm looking for a specific tempo and regularity, too. I even thumbs-downed a Beethoven song! (so unlike me!)