During the prohibition era in the 1920s and early 1930s, some bands played in illegal speakeasies, which generate the genre’s reputation for being immoral and for threatening the country’s cultural values.

The correct answer is: Jazz.

Explanation:

Jazz music was extremely popular during the years of prohibition (1920's to 1930s) and it was part of the underworld.

Jazz was commonly played live in speakeasies, which were underground places dedicated to the selling and consumption of alcoholic beverages. In these places, people went to relax, drink alcohol, and "speak-easy" during the prohibition years.

Jazz music was then associated with illegal and inmoral activities and it started to generate the genre's reputation for threatening the country's cultural values.

In conclusion, the correct answer is: Jazz.