Check out Sonic Pi here: http://www.sonic-pi.net
source: https://github.com/jweather/spi-experiments/blob/master/arpeg-whoosh.spi
source: https://github.com/jweather/spi-experiments/blob/master/deepsaw.spi
source: https://github.com/jweather/spi-experiments/blob/master/lupe.spi
source: https://github.com/jweather/spi-experiments/blob/master/weathertone.spi
source: https://github.com/jweather/spi-experiments/blob/master/floppy.spi and Arduino: https://github.com/jweather/spi-experiments/blob/master/floppy.ino
source: https://github.com/jweather/spi-experiments/blob/master/thing1.spi