How Can I Programmatically Change the Tempo of an MP3 Piano Recording?

[TenNen]

Anyone here knows how I can make my piano sound recorded in a mp3 file play faster, or slower etc using computer programming?
I am not talking about using WinMedia and changing some of its options, but...uhmm..Yes, I think it is the same way as to how such options I believe are to be created, and people usually call it tempo or something similar, I am also not really sure, so do you have any instructions or know of any websites that can help me learn a little more about this ?

Thanks in advance

 

[Wrichik Basu]

If it's a piano file and nothing confidential, why do you want to take the hassle of writing a program? Search Google using "Increase speed of mp3 file online", and you wil get lots of results where you can upload your file, increase the speed and then download it.