How to get the app name of currently music playing ?

I want to get the app name or pid of the running music player, how can I get it in andoird ?
Does android has an interface or something method ?

Thanks

Error with TWRP Custom RecoveryHello, i have a problem on my Moto G, it currently is

Hello, i have a problem on my Moto G, it currently is with the Custom Recovery TWRP and I have a problem to format the date cell, whenever I try it restarts the phone, I tried to update it, exchange it for CWN but the problem remains. Please help me