the blues, (used with a plural verbdepressed spirits; despondency; melancholy: This rainy spell is giving me the blues.
(used with a singular verb) Jazz.

  1. a song, originating with African Americans, that is marked by the frequent occurrence of blue notes, and that takes the basic form, customarily improvised upon in performance, of a 12-bar chorus consisting of a 3-line stanza with the second line repeating the first.