Final answer:
The most popular period for tap dance as a stage form was during the Roaring Twenties, also known as the Jazz Age.
Step-by-step explanation:
Tap dance reached its peak of popularity as a form of stage dance during the Jazz Age, also known as the Roaring Twenties.
This era, epitomized by the nonstop party atmosphere with dynamic dancing, music, and the flapper subculture, saw tap dance flourish in vaudeville shows and on the Broadway stage. This period was marked by significant cultural shifts, including the proliferation of musical theatre and the Harlem Renaissance, all contributing to the tapestry of entertainment that made tap dance the standout performance art of its time.