Emerald

"Emerald" closes Jailbreak and was the other side of "The Boys Are Back in Town" in April 1976. It is the only Thin Lizzy song credited to all four members. Scott Gorham has said the riff was Lynott's and that he and Robertson devised the harmony guitar parts, and, in his words, it is a song about ancient times in ancient Ireland, talking about the warring clans. Biographer Mark Putterford called it the last word on Lynott's burning fascination with Irish history. Gorham told Classic Rock in 2013 that it was the first time Robertson did the bounce-off lead guitar thing, the launching pad for their back-and-forth writing.

It stayed in the set until the band ended. Gary Moore's "Blood of Emeralds" (After the War, 1988) is called a follow-up by Norselands Rock, and Big Country's "Red Fox" is said to have been inspired by its dual-guitar part. No covers, chart history or video were found, and whether our upload is the studio or a live version is unknown.