AKoff Music Composer is music recognition software which performs Wave to Midi conversion. Composer recognizes polyphonic music from microphone (other Wave input or file) and converts it into Midi sequences.
You can sing, whistle or play guitar, piano, flute and so on into your microphone, Composer will automatically recognize and score your music and create standard Midi sequences. Neither a Midi keyboard nor any musical experience are required to compose music.
WIDI is one of the best tools that allows polyphonic conversion. You can take your favorite audio record, convert it into notes and than do with it anything you like. You can even record your own voice and then convert it into score!
Scan-to-MIDI SharpEye Music Reader converts a scanned image of printed music into a MIDI or NIFF file. It does not support direct scanning but will accept BMP and TIFF files.