The Rebbe Rashab wrote: “My revered father (the Rebbe Maharash) told me that my revered grandfather (the Tzemach Tzedek) had handed on the reason that the Alter Rebbe had given as to why his Siddur had not included the zemiros for the meals of Shabbos. The Alter Rebbe had assumed that in the course of the Shabbos meals chassidim would sing wordless melodies, which are loftier than songs with words. On another occasion he gave a different reason: he had assumed that at the table chassidim would discuss Chassidus.1