“Lowercase sound” is the name given to a loose movement in electronic music that emphasizes very quiet sounds and the long, empty silences between them.
Created largely by scientists, techies and experimental musicians, lowercase recordings are frequently based on the magnification of minute sounds through a computer, typically a Macintosh.
Recent compositions include a bubbling symphony of boiling tea kettles, the gentle hiss of blank tapes being played through a stereo and the soft bumps of helium balloons hitting the ceiling.
[via C.K.’s iPod blog]