When i use my iphone with spotyfy works the buttons of beats headphone.
but when use in macbook not works the forward, play/pause.
add this idea
I'm pretty sure this is actually due to OSX and beats not necessarily being compatible. Spotify responds to keyboard media shortcuts and the headphones probably don't send the keyboard input but rather a signal as such. This may not be picked up by the macbook on any media player.
I'm sure if you go to your OSX settings or find an application you might find a way to convert the signal into a keyboard input.