You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Madonna_(entertainer)

Context:
Madonna released her eleventh studio album, Hard Candy, in April 2008. Containing R&B and urban pop influences, the songs on Hard Candy were autobiographical in nature and saw Madonna collaborating with Justin Timberlake, Timbaland, Pharrell Williams and Nate "Danja" Hills. The album debuted at number one in thirty seven countries and on the Billboard 200. Don Shewey from Rolling Stone complimented it as an "impressive taste of her upcoming tour." It received generally positive reviews worldwide though some critics panned it as "an attempt to harness the urban market".

Question:
When was Hard Candy released?

April 2008