"Moaning Lisa" is the sixth episode of the first season of the animated television series "The Simpsons." It originally aired on February 11, 1990. In this episode, Lisa is feeling down and turns to music to express herself, while Homer tries to help her feel better. The episode explores themes of sadness, loneliness, and the importance of expressing one's emotions. It is known for its heartfelt moments and is considered one of the early episodes that showed the emotional depth of the characters on the show.