Now, if this doesn't define "one hit wonder", I don't know what does.
First Class was a British studio band that scored their only major hit with "Beach Baby" in 1974. The curious part about it all was that the band who went on the road wasn't the one that recorded the song in the first place. Singer Del John, for example, took the place of Tony Burrows, who apparently was the original singer on "Beach Baby".
If ya don't believe me, pilgrim, scope it for yourself.: