Task: Explanation
Input (English): The Simpsons Sing the Blues is the first album released as an offshoot of "The Simpsons". The album contains originally recorded music not featured in the series save for the first verse of the track "Moaning Lisa Blues" which was first featured in the episode "Moaning Lisa", which aired in the United States on February 11, 1990. The album was released on December 4, 1990, and peaked at No. 3 on the "Billboard" 200. Question: The Simpsons episode "Moaning Lisa" and "The Simpsons Sing the Blues" were both released what year? Answer: 1990
Output (English):  The album was released on December 4, 1990, and peaked at No. 3 on the Billboard 200.