Blues (noun)

1. A type of music characterized by mournful or melancholy lyrics, usually performed in a slow tempo, and usually accompanied by a guitar, piano, or saxophone.
2. A feeling of sadness or depression.

Origin:

Early 20th century, american english, the blues is a musical form developed by african americans, thought to have originated in the deep south of the united states.

Examples:

1. The singer's voice was filled with the blues as she sang about lost love.
2. He woke up with the blues, feeling down and out of sorts.
3. The blues festival was a celebration of the rich musical tradition of the South.
4. The sound of the guitar playing the blues filled the room with melancholy.
5. She had the blues all day and didn't know why.