Android/iphone app already done that deals with music player

EASY money. You already developed an app for android that deals with music or music player and want some cash. Please ONLY contact me if you have developed an android app that uses the music player anything related to music i would like to know what you have done. for example play music to another person while on the phone or fake a sound to another person while on the phone etc etc anything that you have done with music player I would like to know ONLY apps you already done contact me with details of the specifics of your app I m ready to purchase it. any person that offers me to develop something from scratch will be deleted its bid. I need a portfolio of you have done and I ll buy the app that you already did just give me the details of what it does.