Have no idea what answer to quizette is (the Internet answer sounds plausible tho) but believe that a standard piano keyboard has 88 (eighty-eight) keys.

Without a handy grand in my office I had no way of verifying this theory, wow!

Do any instruments have 100 keys? Tube could imply a church organ. The countries could signify the music from those countries. I'll check Mavs bio again to see if there're any clues in there......