Johann Sebastian Bach himself designed the seal of the Bach Family. Below the crown you may discover the three letters J and S and B with a little effort. On top of these three letters Bach put the same letters again. However, the second time he did such in mirror writing. In a combination, with some added leaves and curlicues beautified and the whole lower ornament crowned, it is what the seal of Bach is about.
99 Music Calendars, Composers Calendars and Bach Calendars