The "Ursprung der musicalisch-Bachischen Familie" is a term that Johann Sebastian Bach created in 1750. In English it's sort of "The Origin of the Bach Family of Musicians", but not word by word. "Ursprung" is part of that term and shortcut for Bach connoisseurs. This Ursprung is a catalog of fifty-three male members of the Bach Family of Musicians, of which the most of made their living with music or were at least considerable musicians.
99 Music Calendars, Composers Calendars and Bach Calendars