Get instant 4-voice harmonization with voice leading on one single click - loading a single-voiced audio file - and create natural sounding background choirs and brass arrangements! vielklang allows you to completely focus on the musical issues rather than technical or theoretical ones, since vielklang is not just a harmonizer; it is packed with musical intelligence and music theory: it automatically detects the best fitting harmonies for each individual input melody, and automatically synthesizes up to four voices with the voices not merely running in parallel but with their voice pitches automatically selected to sound most natural (voice leading).

http://vielklang.zplane.de/index.php?page=demo

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