Lyric discussion by the painkiller 

For some reason ive always assumed that the fifth mentioned in the title refers to a musical interval, the mmost essential musical interval 5 steps in a scale, or seven semitones.

i geuss combining this with the firth thing, the ditty is about a place where music meats the sea.

also on the musical note, the first and the fifth are two notes that put together make the basics for most chords. firth sounds alot like first; when i first read it i assumed it was a misprint

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