From Gailius Raskinis:
Solo Explorer is a wave to MIDI conversion, automatic music transcription (recognition), and score editing software for Windows. It extracts music score out of the the monophonic audio records. You can display, play, edit, and save your music. Solo Explorer supports both prerecorded (Windows PCM 11025/22050/44100 Hz, 8/16 bit, mono/stereo) and direct audio input. It has simple and easy-to-use interface.