These are the instructions on how to install Edge Music Player on Samsung Edge Panel (including Samsung Galaxy S6 edge, Samsung Galaxy S7 Edge, Samsung Galaxy Note Edge).
Step 1: Open Settings > Lock Screen and Security > Unknown Sources (tap to enable it).
Step 2: Download and install Edge Music Player on your Samsung Edge Device.
Step 3: Once you have successfully installed the Edge Player Application on your device, Open the Edge Panel by Swiping from the Left to Right.
Step 4: Now, Tap on the Settings Icon to Open the Edge Settings Menu.
Step 5: Once you are in the Settings Menu, you will be able to see the following screen on your device:
Step 6: Now, Locate the Edge Music Player and Tap on the Checkbox to Enable it.
Step 7: Now, Restart Your Device (required to get everything working properly).
Step 8: Now, Again Swipe from Left to Right to Open the Edge Panel.
Step 9: Now, you will be able to see the Edge Music Player on your Samsung Edge Panel and you are ready to Play any Music that you have on your device.
[*] Samsung Edge Music Player works with almost every music player including Google Play Music, Spotify, PlayerPro Music Player, Poweramp, Amazon Prime Music and lots more.
[*] No Need of Root: Rooting is not required to use the Samsung Edge Player on your Samsung Edge Device.
[*] Why Should I restart the Device? Well, Samsung Edge Player wont be working properly on Samsung Galaxy S6 Edge unless you restart the device after installing the application.
[*] Credits: Samsung Edge Music Player Application is created by hymxdev (xda developer). So, full credit goes to him for sharing the application for free.