ThinkGeek now has for sale a measuring ruler, tuned to the key of C, that you can use to play music. Comes complete with a music book.
Each Musical Ruler with Songbook comes with (guess what?) one musical ruler and one songbook. The songbook will show you how to play it and some basic songs and history. We'll let you in on a secret: you really can play the Musical Ruler! Place your fingers on the finger dots and move it so it overhangs a desk or table. Move it to the mark on the ruler corresponding to the note you want and flick. Like any instrument, it's easy to make a noise but it takes practice, practice, practice to make music. We know you can do it. Heck, after a couple of minutes with the Musical Ruler with Songbook, we were playing Beethoven! Seriously. We were. In the bathroom here (glorious acoustics).
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