The Nickelharpa is a traditional swedish string instrument, dating back to the XVth century, which allies the sound of a violin, and the precision of a piano.
The duo Igudesman and Joo deliver a great rendition of Mozart's Alla Turca in A minor. Well A major... Well A major but with B flat instead of B...
Sławomir Zubrzycki, a polish pianist, built this instrument drawn and invented by Leonardo Da Vinci.
Although it looks like a piano, it sounds like a violin, as the strings are not struck, bowed. This video is an interview of Sławomir Zubrzycki, to understand how it works and sounds.
It's working seems to be similar to the harp wheel, as seen and heard in this other video.
Violin and cello are among the most difficult instruments to play. A french singer and humorist, Bobby Lapointe, said that "Violin, you can either play it right, or play it tzigane". The Salut Salon quartet plays these intstruments, and play around, demonstrating their talent.
So I'm a geek, and love math, and so have always stumbled across this kind of songs. I've already posted a Song from π , here's a reply with π's nemesis : τ1.
1 : π is the ratio between a circle's circumference and it's diameter, roughly 3.14159. τ (pronounced tau) is the ratio between the circumference and the radius, so it's two times π, that is 6.28318.