Wacky?  Yes.  Entertaining?  You be the judge.  A YouTube musician named Andrew Huang has over 20 million views on his channel.  And in his newest video, he plays the song "99 Red Balloons" on ACTUAL red balloons.

He did it by hitting, rubbing, or popping them to make drum sounds.  Then he did the melody by letting air out and making them squeak.

I wish I had that much time on my hands.