really-shit:

Introducing Sharetapes!

Sharetapes are physical cards that contain NFC chips and QR codes so they can play mixtapes on your smartphones and tablets. With Sharetapes you can create your own music collection using Spotify, YouTube, 8tracks and more.

Easily you can create personalised playlists which will then be saved onto your very own Sharetape by hitting record at sharetapes.com.