The Ben E. King song from 1963 was covered by Shirley Bassey the same year (produced by George Martin!). Although the settings of the two renditions are different there is no mistaking the melodic resemblance; the opening melody is repeated in both songs. As I just discovered I (Who Have Nothing) was based on the 1961 Italian song, "Uno Dei Tanti" ("One of Many") which I haven't heard.
The first line of the R Kelly tune is almost identical melodically and lyrically to the first line of the chorus of the Biffy Clyro tune. It's rare that a similarity like this exists both with the melody and lyrics.
As a musician and composer, I’m often struck by similarities between pop songs. If you’ve ever listened to a tune on the radio and thought to yourself, “this sounds really familiar,” or “what does this melody remind me of,” (or more bluntly, “this song is a rip-off of …”) then you have shared in the experience.