Looking Glass were an American rock band who belong to the purest category of one-hit wonder: a single, enduring story-song and almost nothing else. "Brandy (You're a Fine Girl)", released in 1972, is a sea-shanty-flavoured tale of a barmaid in love with a sailor married to the sea, and its irresistible melody carried it to number one on the US Billboard Hot 100.
The band never came close again, but the song has proved remarkably durable, finding a vivid new audience when it featured prominently as a plot point in the 2017 film Guardians of the Galaxy Vol. 2.
On streaming, "Brandy" sits near 600 million plays, while their next genuinely different track trails at only a couple of million. That sends the ratio above 85, many times our 5.0 line.
By our measure Looking Glass are a certified one-hit wonder of the starkest kind. Their catalogue, on the numbers, is essentially a single perfectly told story-song, a 70s curio that a blockbuster film lifted back into the culture decades later while the rest of their work stayed entirely in its shadow.