MOCPlayer (Music On Cloud Player) is an offline MP3 player with very simple design.
Pick your favour music from any source such as local storage, iCloud, Dropbox, OneDrive, GoogleDrive, etc. It depends on what media you added in the Files (iOS app).
Once the music is imported to the playlist and its available in offline. You are not required any internet connection.
Play your favour music in sequence or random mode!