Monday’s ad is for Carling’s Red Cap Ale, from 1950. In this ad, part of a series featuring well-known celebrities of the day and the tagline “I’ve found out,” it features “long-time conductor of the Boston Pops Orchestra” Arthur Fiedler holding a beer and giving his testimonial about why he loves Red Cap Ale. “With a combination of musicianship and showmanship, he made the Boston Pops one of the best-known orchestras in the United States. Fiedler was sometimes criticized for over-popularizing music, particularly when adapting popular songs or edited portions of the classical repertoire, but he kept performances informal and sometimes self-mocking to attract a bigger audience.”