Here's a list for your Friday. Like a lot of lists, it's interesting, puzzling, objection-provoking .... So with that caveat:
A media company called Instant Encore has surveyed classical performances during the past year and calculated composers who were played most often. You can find a few details, and the list itself here.
No surprise that Beethoven and Mozart rank high. I'm a little surprised to see a composer like Bohuslav Martinu come in fairly high. He never composed a "bestseller," though he does have a long list of pieces to his credit. Leonard Bernstein, who does not have a huge list of sonatas, symphonies, chamber works, etc., also shows up fairly high--maybe all those Broadway performances of "West Side Story"? Anyhow. I'm quibbling, so maybe the list is doing its job.
(Disclosure: We sometimes partner with Instant Encore in offering downloads to you, such as this recent recital by Susan Graham.)