Define blues with reference to formal structure of lyrics, blue notes, and rhythmic complexity

What will be an ideal response?

• Lyrics to blues songs are organized into a series of three-line (A A B) or quatrain-refrain (a b c d A B) stanzas that are usually twelve bars/measures in length
• Melodies in blues songs create blue notes by deliberately sliding between standard pitches (which are based on the pitch "A" above "middle C" being exactly 440 cycles per second).
• Blues songs are rhythmically complex due to polyrhythms between the different parts (e.g., voice and accompanying guitar) and syncopation (emphasizing normally unaccented beats or accenting notes that fall in between the beats).