2010 Nov 21
Text -> Music -> Text Music -> Text -> Music So #2 is pretty common and there are a few variants that work and are completely reversible (e.g. MIDI) and even more that are not very easily reversible (e.g. most Audio file formats [MP3, WAV, etc]). The primary difference is that the later are designed to be digital transforms for auditory sound (i.e. any noise), where as the former are specifically for music, or the written interpretation of music.