How to send songs
I have a Galaxy S4 in all apps, there's a folder named My Files. Find the song you want, click share, choose Wifi Direct and an option will appear to search for other devices. The quickest way I found to find the device your trying to beam to is to find a random file in the My Files app on the receiving device and beam it thru Wifi Direct. Once the two devices have found each other and established a link you should be able to send all the songs you want. On an additional note I sent songs to a Verizon Galaxy Note 2 from my T-Mobile S4.