"Doremi" refers to the musical scale syllables commonly used in solfège or the solfeggio system. In the clue you provided, it refers to a classic show tune with the lyrics "When you know the notes to sing, you can sing most anything."
Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: Classic show tune with the lyric "When you know the notes to sing, you can sing most anything". Explanations are generated by AI and may be inaccurate.