As Petrobelli wrote, Tartini's "declared intent was to achieve in the instrumental field, with a language suited to the nature of the instrument, the affections that are perfectly outlined in the arias of Metastasio's operas." The first sonatas of the collection are mostly structured in three movements, with a slow movement followed by two fast ones, as was Tartini's favourite scheme from the eighth sonata, instead, the structure in four movements becomes predominant, with a rich variety of formal patterns. Some movements bear mottos and literary quotations (like Metastasio's arias, frequently used also in the concertos, or Tasso's Aria Lieto ti prendo with which Tartini opens his Sonata No. 12 in G major, taken from the 12th canto of the Gerusalemme liberata). In them Tartini makes a fine display of his inexhaustible melodic creativity, always shunning easy symmetries and predictable developments. There are many passages with polyphonic hints, although virtuosity always appears subject to expressiveness and never a simple show of bravura. Frequent also are the hints and melodic inflections echoing popular songs and dances of the day, as for example in the Canzone Venetiana of the Sonata No. 12 in G major, or the second movement (Allegro assai) of the Sonata No. 5 in F major. Tartini is never obvious and even less predictable secluded in his Padua, he was a self-contained composer who disdained the world around him and possessed the creative power typical of - indeed, almost exclusive to - great anachronistic men.