'Music' from /dev/urandom
Here is one with the blues scale. From time to time it grooves really nice.<p><pre><code>  cat /dev/urandom | hexdump -v -e '/1 "%u\n"' | awk '{ split("0,3,5,6,7,10,12",a,","); for (i = 0; i < 1; i+= 0.0001) printf("%08X\n", 100*sin(1382*exp((a[$1 % 8]/12)*log(2))*i)) }' | xxd -r -p | aplay -c 2 -f S32_LE -r 24000</code></pre>