JavaScript has been around for a long, long time. But it seems that people are only now discovering what it's capable of. Granted, it's only in recent years that browsers really started to put an emphasis on JavaScript performance, thanks to Chrome in particular, and this definitely had something to do with the surge in interesting projects.
While some are serious business, Node.js for example, others are on the fun side of things. Dance.js is an example of the latter, as the name implies. It's described as a "high-level audio API, designed to make sweet visualizations" and it's
available on GitHub, natch.
It works with Mozilla's Audio Data API and the WebKit Web Audio API, but it can uses Flash too, if all else fails. There's a sweet and brostep-heavy
demo for it here. It's using HTML5 Canvas and WebGL for the visualization, so you may get some low frame-rates if you're going full screen.
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