App for music videos on iPhone?

I've seen a lot of people listen to music (watching vids) on their iPhones and I wanna know what's the name of the app they use! All I know is that there's no need of Wi-Fi

If you have data on your phone you can stream and watch videos on youtube. You can use youtube with or without Wi-Fi. It streams music videos too. Another app that shows mostly music videos is called Vevo

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