First of all write or copy a melody into tonica.

Ask tonica to harmonize your melody.

Listen to the initial four part harmonisation above.
Instead of a ‘plain’ four part harmonisation it can be changed at the click of a button into a prelude, canon, jazz composition or fugue. By mouseclicking “Variation”, tonica fugata will turn it into a prelude.
tonica fugata comes with particularly beautiful, virtuous prelude styles. Listen to “Happy Birthday” as quartet.
Test it yourself. download the windows or Mac version and select the option for a 15-day free trial version