My 1930's apartment has one of those "scare you out of your britches" loud mechanical metal-on-metal doorbells. I've been considering replacing it with a wireless model, but I've yet to find one with a tone I like enough to bother. But now I know I can use a $12 9V recording module from the Radio Shack down the street to realize my dream of answering the door to The Smiths "Barbarism Begins at Home" or Guns N' Roses' "Knockin' on Heaven's Door"...
How to Add Custom Ringtones to a Wireless Doorbell by DIYHacksAndHowTos
What You'll Need:
Wireless Doorbell (and required batteries) 9V recording module (RadioShack Model: 276-1323) 9 volt battery Wire strippers Wire Cutters Soldering Iron and Solder (optional) Hot glue and hot glue gun (optional)
Seems reasonable enough for anyone comfortable soldering and doing a little rewiring. Of course, you can skip jumping through all the DIY hoops and buy an off-the-shelf MP3 ringtone solution with similar features (which I'd probably do).