Let me say from the start I am an absolute beginner.
I want to make a doorbell that after pressing a button plays a number of subsequent sounds in a melody. Namely - the beginning of Bach's toccata and fugue d-minor.

What would I need to make such a circuit?

 

If it is a song then how realistic would u like to play it. Audio is atleast 16bit. Melody can be 4 or 8 bit.
The higher the bit rate the realistic is the sound

Second is the button wired or wireless.

 

Hello,

How many nots do you want to play?
Here is an example of a 10 note sequencer:
10 Note Tone Sequencer.pdf

Bertus

 

I want 9 sounds of varying frequency and length. You know, the opening of the toccata. I'm not sure about the bit rate... What is the difference? I would opt for the one easiest to make ;-)
I'm thinking wired, but if wireless is not that much more difficult then perhaps wireless.

 

How about buying a wireless one on ebay and modifying the ring tone Assy. I bet it is do-able

 

Hi,

I have once made a circuit based on a 16F628A wich produced sound output from its PWM, fairly easy to do if you just want to press button, then tune out. I would suggest going that road if you are comfortable with PIC's

Good Luck

 

One easy way out is to buy an inexpensive recordable greeting card and record your own sound or music.

Something like this:
http://www.soundexpressiongreetings.com/musical-greetings/recordable-sound-modules.html

If you want to roll your own you can try:

http://www.atmel.com/Images/doc1456.pdf

 

I used one of these as a doorbell years ago, worked great.

 

I've got an 8ohm loudspeaker now, it's not very good to be honest, it wails like a siren. But anyway, is there a relation between the emitted frequency of sound and RC?

 

You could also get one of these. http://www.echelleinconnue.net/outils/mobio/composants/TDB380_datasheet_V2_(Tenda_Electronics).pdf I have not used one them my self yet.