But first, let me re-try a question for Mac users I posted on Twitter and only got a couple of responses to:
Does anyone have a favorite, freely-downloadable anti-virus/malware program (there are several) for Macs (actually for an older MacBook Pro still on Lion OS X)? How about Mac "tune-up"/cleanup software... favorites?.
...and now to the main feature:
H/T to "3 Quarks Daily" blog which passed along this 4-min. YouTube video on music and math (watch it for the math, or for the Beethoven!):
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