I figure OP stands for "original post", not "original poster".

>> A given programming language may not have a built in representation for rational numbers in general.

Why did you say this?

> I don't really use Spotify so I can't compare but Pandora was awesome. I've found Youtube playlists to be the best replacement so far.

You do realize Pandora is still there, right?

I've found a lot of great music through Pandora.

It's very miss-or-miss; you need to be willing to thumb down 95% of what Pandora thinks you'll like. But with enough care, it's a good discovery channel.

It caused all kinds of problems, though those tend to be more directly traceable to the "be liberal in what you accept" ethos than to the format per se.