Musician James Hancock performed the theme to “Interstellar” on a 12-jet hydraulophone, an woodwind-style instrument that is also known as an underwater pipe organ. The instrument was invented by the “father of wearable computing” Steve Mann at the Center for Computer Research in Music and Acoustics at Stanford University and uses jets to create different tones as the water is temporarily blocked from the soundhole.
Because the sound is produced by the medium that’s in direct contact with your fingers (the water), you can exert a lot of subtle control over shaping and sculpting the sound. You can play chords on hydraulophone, and you can separately sculpt and shape each note in the chord, and do this continuously while the note is sounding.
via Boing Boing