The Black Dog is a metaphorical representation of melancholy or depression.
This phrase dates from the late 18th century, and may derive from folk tales of ghostly black dogs tormenting people.
"The black dog has been used as a metaphor for depression from classical mythology through medieval folklore to Churchill. It acts as a symbol to externalise moods and thoughts that are difficult to communicate"
How does this relate to tonights Surprise Songs --
Tonights guitar surprise songs LONG STORY SHORT x STORY OF US
LONG STORY SHORT and STORY OF US are representations of depression. The narrator is in the rabbit hole of depression, it was a bad time, misery. In Story of Us it was also misery as there was miscommunication and a fall out. They both resolve with THE END and I SURVIVED.
Tonights piano surprise songs CLEAN x EVERMORE
CLEAN and EVERMORE are both representations of going through a depression with resolution at the end that the narrator is CLEAN and will not feel the pain for EVERMORE.
i screamed so loud but no one heard a thing, clean