What do you mean by ROM? My phone does not have its default music player.

[AC Question]

When I bought it, I did not realize that it does not have default music player. The only music player it has is the Google Play Music. My phone is Samsung A3 (single sim) Please help me on how to fix it. Thank you!

 

[B. Diddy]

Welcome to Android Central! Are you responding to someone else? Please note that we would have no idea what other thread you might be referring to, since you're still posting as an unregistered guest. Perhaps you could register on these forums so that you could continue your discussion in the same thread you created?

To answer your question, if Google Play Music was the only music app that came with the phone, then the omission of the stock Music app was presumably intentional. There are many 3rd party music apps you can try on Google Play Store, like MortPlayer Music, PowerAmp, and more.