'Music' from /dev/urandom(blog.robertelder.org)

  cat /dev/urandom | hexdump -v -e '/1 "%u\n"' | awk '{ split("4,5,7,11",a,","); for (i = 0; i < 1; i+= 0.0001) printf("%08X\n", 100*sin(1046*exp((a[$1 % 8]/12)*log(2))*i)) }' | xxd -r -p | aplay -c 2 -f S32_LE -r 24000

    awk 'function wl() {
        rate=64000;
        return (rate/160)*(0.87055^(int(rand()*10)))};
    BEGIN {
        srand();
        wla=wl();
        while(1) {
            wlb=wla;
            wla=wl();
            if (wla==wlb)
                {wla*=2;};
            d=(rand()*10+5)*rate/4;
            a=b=0; c=128;
            ca=40/wla; cb=20/wlb;
            de=rate/10; di=0;
            for (i=0;i<d;i++) {
                a++; b++; di++; c+=ca+cb;
                if (a>wla)
                    {a=0; ca*=-1};
                if (b>wlb)
                    {b=0; cb*=-1};
                if (di>de)
                    {di=0; ca*=0.9; cb*=0.9};
                printf("%c",c)};
            c=int(c);
            while(c!=128) {
                c<128?c++:c--;
                printf("%c",c)};};}' | sox -t raw -r 64k -c 1 -e unsigned -b 8 - -d

    cat /dev/urandom | hexdump -v -e '/1 "%u\n"' | awk '{ split("0,2,4,5,7,9,11,12",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 | sox -traw -r44100 -b16 -e unsigned-integer - -tcoreaudio