Amazing app+addition requests

I love this game! My favourite artist is shinee so i love collecting their cards and using them. I spend my long bus rides playing this and it is so much fun. No issues on my half. 
My only reccomendation is that you add songs. As there are chinese, korean, and english songs, i would love it if you added the artists japanese songs (Best from now on, countfown, sunny day, horololo, etc) or the missing artists/ Songs (Shinhwa, H.O.T, Stand up, KEY, Super junior KRY, s.e.s, etc)
This is all i have to request! Thank you!