The title "Rhapsody in Blue" is a reference to the improvisational nature of the piece and the use of the blues scale as a central theme.
If you're looking for the lyrics of a song called "Rhapsody Blue", it's possible that you're thinking of a different song. To help me identify the correct song, could you tell me:
* Who is the artist?
* What genre of music is it?
* Any other details you remember about the song?
With this information, I can try to help you find the lyrics you're looking for.