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In some cases, they’re up-and-comers who teach by day and jam by night; in others, they’re established figures who return to school to share their unique knowledge.So with school back in session, here’s a salute to ten major musicians who (at least) once stepped off stage and rocked a chalkboard.And we know that there's a generalized way to describe that.And we go into more depth and kind of prove it in other Khan Academy videos.In the last video, we give a bit of an overview of potassium-argon dating.In this video, I want to go through a concrete example.And it'll get a little bit mathy, usually involving a little bit of algebra or a little bit of exponential decay, but to really show you how you can actually figure out the age of some volcanic rock using this technique, using a little bit of mathematics.
It might be 1 gram, kilogram, 5 grams-- whatever it might be-- whatever we start with, we take e to the negative k times 1.25 billion years. So you get the natural log of 1/2-- we don't have that N0 there anymore-- is equal to the natural log of this thing.Other important influences on rockabilly include western swing, boogie woogie, jump blues, and electric blues.the influence and success of the style waned in the 1960s; nonetheless, during the late 1970s and early 1980s, rockabilly enjoyed a major revival.Bob Wills and his Texas Playboys were the leading proponents of Western Swing, which combined country singing and steel guitar with big band jazz influences and horn sections; Wills's music found massive popularity.Recordings of Wills's from the mid 1940s to the early 1950s include "two beat jazz" rhythms, "jazz choruses", and guitar work that preceded early rockabilly recordings. Why, man, that's the same kind of music we've been playin' since 1928! But it's just basic rhythm and has gone by a lot of different names in my time.