Actually you can easily transfer media from your pc to Samsung by dragging and dropping files into the phone storage.
You must first connect the phone to your pc with the included charging cable, and wait for all the drivers to finish loading.
Then open a file location on your phone and start transferring the music.
Alternatively, if you have all your music in itunes, you could download the "Apple Music" app, from the google play store directly to your Samsung phone, and get all your music that way.
You should be able to listen through your wireless beats, and control the music through the smartwatch or your phone