I have a pile of these left and I've missed giving them out at exhibitions and shows! They're postcards that I had printed after my graduating with my masters degree, because the original ones that the school printed for us all but evaporated during the festivities! I really love the design too so I wanted them to be my trademark for a while longer. 
 
The necklace is in reality a very long (2m) chain that you wrap around your neck in order to wear. The coolest part is that it's literally the entire song, from start to finish, and you can follow the music in the shapes. Each link is 8 bars/beats, the little circles represent the percussion, and the lines are the chords and harmonies. It took me about a month to make and it lives in my studio with me. I could never sell it.