Bach's work would have been lost to obscurity were it not for Mendelssohns rediscovery and promotion of his work about 50y after J.S. Bach's death, and causing a revival that kept the work alive. I'm trying to find good sources for the story as it's part of an example how someone trying to assimilate into european society (Mendelssohn was a jewish convert to christianity, likely to find work) was responsible for defn…
Mozart, who was himself a great master of counterpoint, was understandably delighted by the Bach fugues that Baron Van Swieten showed him. Mozart was of course very heavily indebted to Johann Christian, but several pieces were clearly homages to the elder Bach; the subject from the K. 394 fugue was clearly derived from the first of the WTK, and the K. 574 Gigue (composed in Leipzig, no less) is obviously Bachian pastiche. The armoured men chorus from the Magic Flute sets a protestant chorale (often used by Bach) in a Bachian setting. That's not to mention the string quartet arrangements of Bach's fugues that Mozart made.