Harmony Assistant for Windows Harmony is a versatile music editor/player/arranger for Windows. The essential software for music lovers and composers, with automatic accompaniments, drum patterns, and many other built-in tools. ... Cost: $70 Buy full version       Trial version       Publisher: Myriad     Descriptions Harmony Assistant for Windows: Harmony is a versatile music editor/player/arranger for Windows. The essential software for music lovers and composers, with automatic accompaniments, drum patterns, and many other built-in tools.