This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.

The Bronx's evolution from a hot bed of Latin jazz to an incubator of hip hop was the subject of an award-winning documentary, produced by City Lore and broadcast on PBS in 2006, "From Mambo to Hip Hop: A South Bronx Tale". Hip Hop first emerged in the South Bronx in the early 1970s. The New York Times has identified 1520 Sedgwick Avenue "an otherwise unremarkable high-rise just north of the Cross Bronx Expressway and hard along the Major Deegan Expressway" as a starting point, where DJ Kool Herc presided over parties in the community room.
When did a PBS documentary air about the Bronx's music history?