No previous song on the headphones remote controller

I hate this issue! I'm used to changing songs by using the small buttons on the headphones' wire and when I love a song I always play it couple of times. But with the SGS5 it's impossible to do that, because the app allows you only to play the next song.

No previous song on the headphones fix
Using a third party app will fix this problem. I recommend the Poweramp Music Player, a complex music app that has tons of features under the hood. It will enable the "previous song" function on your headset.