The first Double Groove single (A.side)
What song plays first depends on which groove the needle settles in...
Pop Muzik on side 1 is the normal short fade-out version, side 2 is the long version with the sudden ending.
The back of the sleeve shows the same catalogue number as the 7" sleeve but 12 MCA 413 on the labels. Also, the sleeve has a side opening on the 12".