You could use an old cassette from a Commodore 64. They sound really nice. I gave one to a girl once as a joke. She fell in love...
and then I broke her heart...
This is bringing back memories of writing programs in basic, making random lo-res colors flash across the screen. The peak of my programming was using massive amounts of 'peek' and 'poke' commands, what tediousness!
10 Pr#2
20 Home
30 goto 10
40 end
I think that's Apple....logo was fun too...how about fortran?