Long before it was possible to download music by the song ...
  Before MP3s ...
    Before the Internet ...
      Before digital compact discs ...
        Even before cassette tapes ...
"Top 40" music was on 7 inch, 45 RPM vinyl platters.

A 45 fit a single song on each side.  The "A" side was the Top 40 hit.  The "B" side was something the band wanted the public to hear, but not something the record company thought had Top 40 potential.

This is the "B" side.

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