I think it was called something "levels of abstraction" or "layers of abstraction". There were interactive little animations for each thing.

@BenWard I was just noticing that. Thanks.

Remember that page from a couple months ago about teaching algorithms? The example was a car staying on the road. What's the URL for that?

@ajsharp I remember it. It was something like "layers of abstraction" or "levels of abstraction". Something like that.

@BenWard Oh yeah, huh. I guess I can just drop each of song into an hAudio wrapper, then into an ol > li. That'll work. Thanks!