In keeping with Rocks Off's latest obsession, compiling soundtracks for oddball holidays, we were tickled pink as a chorus girl's nipple to learn that this Friday is Pi Approximation Day.

The holiday was first in 1988 by a physicist named Larry Shaw, who made everyone march in a circle then eat several fruit pies, proving that science is really only three shots away from being a frat party. Nonetheless, in 2009 the House of Representatives made March 14 Pi Day and July 22 Pi Approximation Day.

Pi, for those who may have failed geometry, is a mathematical constant famous for the fact that it basically represents infinity and can therefore be used to calculate the area of a circle and other things that writers have no freakin' idea about. The number is usually represented by the number 3.14 (Hence the March 14 date) or by the fraction 22/7 (hence the July 22 date).

Nobel Prize-winning poets have written odes to Pi, Star Trek used it as a plot device in an episode, Darren Aronofsky made a film about it, and there are even a few good songs about it. So with that in mind we tried to get as much musical love for a number as we possibly could.

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The Wife With One F is a huge Tori Amos fan, and for some reason that means we're not allowed to listen to Kate Bush. No, we don't have any idea why, either. Bush penned this tune for her album Ariel, and it deals with an odd man obsessed with numbers. She spends most of the nine-minute tune reciting a fair amount of Pi.

Pi may represent infinity, but for us the true number of forever is represented by the Infinity Waltz discovered by the Legendary Pink Dots. The full story of that discovery can be read here, but we'll sum it up for you this way; The Dots thought that there needed to be a new Number of the Beast because 666 looks like three swimming ducks.

Hard 'n Phirm is a defunct musical-comedy duo; at least that's what Wikipedia told us. The lyrics to "Pi" involves slaughter on an altar and the death of God, as well as a few rhymes about all the tail they're getting. Not exactly Weird Al, but fun for all that.

When we first started listening to A Love Like Pi, it buried the needle on the fuckin'-hipster-meter in our head. However, after we calmed down a bit we had to admit the little band from Red Bank, N.J., is actually a lot of fun to listen to. Sort of light-hearted Green Day meets Crystal Castles. Don't know if we love them like all of Pi, but we can dig on them for at least a few digits.

If we're going to talk about magic numbers, then we're going to mention 666, the famous Number of the Beast. No matter how many times scholars tell us its just code for Nero's name, it still crops up in all kinds of spooky theories. Don't crucify us, but we wanted to use this opportunity to give this cover of the Iron Maiden classic by the doomed Billy Corgan project Djali Zwan a spin rather than the original. It's still the best part of the movie Spun.