Haftarah Cantillation
The haftarah is read with cantillation according to a unique melody (not with the same cantillation melody as the Torah). The tradition to read Nevi'im with its own special melody is attested to in late medieval sources, both Ashkenazic and Sephardic. A medieval Sephardic source notes that the melody for the haftarot is a slight variation of the tune used for reading the books of Nevi'im in general (presumably for study purposes), and Jews of Iraqi origin to this day preserve separate "Neviim" and "Haftarah" melodies.
Note that although many selections from Nevi'im are read as haftarot over the course of the year, the books of Nevi'im are not read in their entirety (as opposed to the Torah). Since Nevi'im as a whole is not covered in the liturgy, the melodies for certain rare cantillation notes which appear in the books of Nevi'im but not in the haftarot have been forgotten. For more on this, see Nevi'im.
The Haftarot for the morning of Tisha b'Av, and for the Shabbat preceding it, are, in many synagogues, predominantly read to the cantillation melody used for the public reading of the Book of Lamentations, or Eicha.
Leonard Bernstein employed the Haftarah cantillation melody extensively as a theme in the second movement ("Profanation") of his Symphony No. 1 ("Jeremiah").
Read more about this topic: Haftarah