I want to know the answer to the following question:
During and after the 80's, what helped a cappella music rise in popularity?
All the background I'm provided with is that "A cappella music attained renewed prominence from the late 1980s onward, spurred by the success of Top 40 recordings by artists such as The Manhattan Transfer, Bobby McFerrin, Huey Lewis and the News, All-4-One,". Is that enough to answer the question?