Music composition

A method of composing music, comprising:

• receiving a first series of musical notes defining a first melody having a first harmony;
• automatically detecting a musical key defined by said first series of musical notes;
• analyzing the first harmony within the first melody using said automatically-detected musical key, by forming examples from the first series of musical notes, and deriving, in real-time, at least first and second rules relating to the first melody, the second rule conflicting with the first rule, and each of said first and second rules including a weight associated therewith;
• receiving additional notes of said melody and forming additional examples from said additional notes;
• determining ones of said additional examples that agree with said first rule and increasing a weight of said first rule when an example agrees with said first rule, and determining ones of said additional examples that agree with said second rule and increasing a weight of said second rule when an example agrees with said second rule;
• receiving another melody to which a harmony is to be formed;
• evaluating said another melody using both of said first and second rules;
• and
• when both said first and second rules each apply to said another melody, applying the one of said rules which has the higher weight to said melody, in real-time.