Wiktionary
phr. (context British slang English) It's all over; nothing more can be done
Wikipedia
Goodnight Vienna is the fourth studio album by Ringo Starr. It was recorded in the summer of 1974 in Los Angeles, and released later that year. Goodnight Vienna followed the commercially successful predecessor Ringo, and Starr used many of the same players, including Billy Preston, Klaus Voormann, Robbie Robertson, Harry Nilsson, and producer Richard Perry. The title is a Liverpool slang phrase meaning "it's all over".
"(It's All Down to) Goodnight Vienna", an up-tempo John Lennon composition, is the title track to Ringo Starr's 1974 album Goodnight Vienna. The final song on the album is "Goodnight Vienna (reprise)". Also released as a single, the single version is a medley combination of "(It's All Down to) Goodnight Vienna" and "Goodnight Vienna (reprise)". The single was released in the US on 2 June 1975.
The title song features John Lennon on opening count-in and piano, and Billy Preston on clavinet; and the Reprise song features Lennon's intro, 'OK, with gusto, boys, with gusto!'.