Lisa's jazz-playing mentor was Bleeding Gums ...who?
Lisa Simpson timeline has been contradicted in subsequent episodes. Lisa's year of birth is given in "Lisa's First Word" (season 4, 1992) as 1984, during the Summer Olympics. The episode "That '90s Show" (season 19, 2008), however, contradicts much of the established backstory; for example, it presents Homer and Marge as being childless in the late 1990s. Lisa is a lover of music, with jazz as her favorite genre. She enjoys and excels at playing the saxophone and became friends with jazz musician Bleeding Gums Murphy, whom she regards as an idol. Murphy helps pull Lisa out of her depression in "Moaning
'Round Springfield to honor Bleeding Gums' memory is by having his album played at the local jazz station. Lisa spots it in the Android Dungeon store for $250, but after hearing that Bleeding Gums is dead, Comic Book Guy doubles the price to $500. Bart then walks in with his $500 to buy the ultimate pog with Steve Allen's face. However, after remembering that Lisa was the only one who believed him about his stomachache, Bart decides to buy the album with his money. Lisa thanks him for it, and when the station plays one of Bleeding Gums's songs, Lisa is disappointed