The principle of resonance, fundamental to the musical aesthetic of the Baroque, had been inherited from the Renaissance, together with its poetical and philosophical implications. The contemporary techniques of instrument-making tend all towards satisfying this essential and vital principle. Lutes are set up with double strings, the courses, viols are built as lyra-viols with symphathetic strings, the “da braccio” family flourishes into the viole d’amore. Even in the Classical period, instruments such as the baryton, much favoured by the Prince Esterhazy and enriched by the compositions by F.J. Haydn, still reflect the contemporary musical taste and the importance given to this fundamental principle.