Final answer:
The headliner concerts at the June 2011 International Jazz Festival were held in Rochester.
Step-by-step explanation:
The question asks about the location of headliner concerts at a June 2011 International Jazz Festival. Considering the historical importance of Harlem as a jazz hub, as indicated in the provided reference, one might think of New York; however, this information does not directly answer the question about the specific event in 2011.
Rochester
is the answer to your question; the Rochester International Jazz Festival is an annual event that features a wide array of jazz artists and was indeed held in June 2011. While other cities like
New Orleans
,
Memphis
, and
Chicago
are also renowned for their musical heritage and could host jazz festivals, in this instance, the festival in question took place in Rochester.