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Hi,
There is no way to change anything on the default lockscreen, but there are loads of 3rd party apps that can replace the default one and be configured. Go Locker for example.
For media, I am not sure if you mean movies or audio. For audio I use PowerAMP and for movies VPlayer.

Try widget locker.
That's $2.99, and sadly I was looking for a free app (all apps should be free!).


Try widget locker.