These observations are not huge deals, but just a bit odd from my perspective. I thought I'd look up some baroque and classical composers just for fun.
1. Interestingly, "Life of composer Antonio Vivaldi" is only one year (1741).
2. If you type in a filter of "composer", you get greats like Mozart (under "Life of composer Wolfgang Amadeus Mozart") and Schubert (under "Life of composer Franz Schubert"), but J.S. Bach is under "Life of Johann Sebastian Bach". That is, the word "composer" is left out.
3. The lives of Handel and Beethoven are left out altogether, although performance dates of some of their works are included.