Final answer:
The sign above the Motown door did not have a fixed message, but different signs were used for different themes or events. During World War II, a sign with the American flag was used. In Richmond, Virginia, a business owner put up a sign with positive messages and Bible verses over a broken window.
Step-by-step explanation:
The sign above the Motown door did not have a single fixed message. However, there were various signs that were put up at different times to represent different themes or events. For example, during World War II, a sign with the American flag was used near a proposed housing project in Detroit. Additionally, in Richmond, Virginia, a business owner put up a sign with positive messages and Bible verses over a window broken during protests. It is important to note that Motown is primarily known as a record company, and its sign may have focused more on displaying the Motown brand rather than conveying a specific message.