I am looking for a collection or database of samples of individual notes played on a variety of instruments, available in common audio formats (OGG, WAV, etc.). At a bare minimum, some kind of piano playing the middle C would do fine.
The only samples I currently have are the two piano samples that come packaged with LMMS, but one of them is grainy and the other is very short, which doesn't lend itself well to creating decent-sounding notes of variable length (ultimately, I want several audio samples of a given note that are of varying lengths).
I've been googling for an hour or so now, apparently in vain. Is there such a thing?