The technology is quite similar to OCR which helps people scan books, documents, and whatnot. The technology that computers acquire to read through sheet music is known as Optical Music Recognition (OMR). Part 1: What Is Optical Music Recognition (OMR) Part 2: Best PDF to MIDI Converter Method 1: Sheet Music Scanner Method 2: Forscore Method 3: PiaScore Method 4: SuperScore Music Method 5: MuseScore (Free) Method 6: PlayScore Method 7: ScanScore Method 8: SmartScore Method 9: Sibelius Method 10: Audiveris Method 11: SharpEye Method 12: PDFtoMusic Part 3: How to Convert PDF to MIDI Online? Part 4: Ideal Solution for All Your PDF Needs