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Songs in the Key of Springfield was created on 1997-03-18.
It debuted on The Simpsons second episode in 1990, but it was released on the first Simpsons soundtrack in 1997, Songs in the Key of Springfield.
Songs in the Key of You was created in 2001.
Songs in the Key of Z was created in 2000.
Songs in the Key of Kids was created in 1993.