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iOS 4 adds direct access to iTunes library, iPhone DJ apps about to get crazy

Although there's been no shortage of iPhone DJ apps in the past few years, they've remained fairly niche, since Apple didn't allow devs official access to the iPod music library -- mobile DJs needed to upload a second separate music library per app, and that's no fun at all. Looks like that's about to change, though: one of the 1500 new APIs in iOS 4 provides direct access to the iPod library, meaning music apps of all kinds can play your tracks in any wacky way they want -- including, yes, scratching them. The first app to support the new API in the store is Flare Scratch, which is a relatively simple scratch app -- we just gave it a shot and yes, it does indeed load tracks from the iPod library and let you scratch 'em. There's a bit of a wait when loading up a new track, though, so it's not totally fluid to use in anything but a hey-this-is-fun context, but we're betting we'll see more serious DJ apps hit with smoother transitions soon enough -- and we can't wait to see what devs do once iOS 4 hits the iPad and they've got more room to work with. Video after the break.