Good video/music app for iPhone?

Does anyone know a good FREE app that I can download music or videos from YouTube or something?

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You have to try Musictube. It's on Appstore and it's free.
You can download any Youtube-video to the app and have access to them anytime--even without Internet.
You can have playlists, play music on repeat, shuffle et cetera.
It's super-fast and really easy to use. It can't save to the camera roll, though, so if that's what you're after then Musictube won't work for you.
I searched for an app like this for months and found this about a week ago or so. This is now my favorite app.

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