Question: The Simpsons Sing the Blues is the first album released as an offshoot of "The Simpsons", the album contains originally recorded music, the first verse of the track "Moaning Lisa Blues" which was first featured in which episode, the sixth episode of "The Simpsons"' first season, and originally aired on the Fox network in the United States on February 11, 1990?
Sentence (from "Moaning Lisa"): "Moaning Lisa" is the sixth episode of "The Simpsons"<nowiki>'</nowiki> first season.
Relevant evidence: Yes