Hey carta, soundclick.com will let you upload all sorts of soundfile formats.

And if you mean uploading it from a player or something, what do you have it recorded on? With its basic playback feature and if it has a headphone slot you can connect an audio wire from your headphone/aux slot into your mic port on your computer, and just use a program to record it, therefore, only records whats on the device, no background noise ;p

This is how I used to record my guitar from my amplifier.