started implemented of ApiMusicImpl
Merge branch 'master' of https://github.com/LO23/BitMusic
implemented 4 first methods
Merge branch 'master' of https://github.com/LO23/BitMusic
Merge branch 'master' of https://github.com/LO23/BitMusic
Merge pull request #161 from amina196/master

[music] implemented 4 first methods of ApiMusicImpl