Mozart The Thirteen Early String Quartets Study Score

In his youth, Mozart produced two authentic cycles of six string quartets: K.155 160 (Nos.2 7) and K.168 173 (Nos.8 13). Together with their forerunner, the so-called “Lodi” Quartet, K.80 (No.1), this adds up to atotal of thirteen juvenile quartets, all of which may be regarded as early prototypes of their genre. - Urtext of the New Mozart Edition