Wav to Midi (or notation) is damn near impossible to do with current software (I should know, I have tried most of them). YES, it can be done, but the results will vary greatly. A solo instrument with a distinguishable tone (say a flute) can be translated pretty easily (with decent accuracy), but a full ensemble mixed down cannot be separated, instrument by instrument by any software I know of.
this has been a kind of 'holy grail' amongst computer musicians for some time now. If you find anything that can pull it off, send me a link.