LuSo Music

You can play online or offline .
You can play streaming from google play music if you login by google account. Getting pinned songs from the Google Play Music app.
LuSo Music scan all folders in your device which contain music file and filter it by Albumes , Artist , Playlist , Songs , Genres .
it supports many and many file extension including
".mp3", ".3gp", ".mp4", ".m4a", ".aac", ".ts",
".flac", ".mid", ".xmf", ".mxmf", ".midi", ".rtttl",
".rtx", ".ota", ".imy", ".ogg", ".mkv", ".wav"
and more extension format updating.

LuSo Music can look for any free music which available on internet by using searching tool .
- go to Settings > Equalizer to apply any song which you want to adjust it .

of course , It is free