Political theory, however, is based on argumentation and reasoned reflection. It is subject to systematic critical reflection, which has mostly been affected by the stamp of Ancient Greek thought. Ancient Greek tradition of political thinking produced a canon in both senses of the term: the first is a collection of works and ways of approaching to the “political”, deemed as inspiring sources of reference, and the second is pieces of melodies (regarded as themes) which are reproduced and imitated in other parts of the musical compositions (regarded as works of political theory).