Which of the following songs is the 'signature song' used by Tom Jones?

The 1965 song that Tom Jones (b. June 1940, a Welsh singer) has used as his signature song' is "It's Not Unusual". It was written by Les Reed, an English songwriter, along with Jones' manager Gordon Mills. They wrote it for the British singer Sandie Shaw, but she turned it down. Jones saw the song's potential, recorded it in 1964, and it became his first hit single. Jones recorded what was intended to be a demo for Shaw, but when she heard it she was so impressed with Jones's delivery that she declined the song and recommended that Jones release it.

The swinging song, a classic case of lyrical dissonance, is one where Jones sings about the devastating pain of seeing a former girlfriend out with another guy. "I wanna die," he proclaims, in contrast to the jaunty tune.

The lyrics of the song mean that this given situation happens a lot or is often witnessed. The song's sentiment as acutely expressed focuses on a guy who, even if somewhat frustrated with love, seems to be taking it all in stride, as the tune is overall upbeat.

"It's Not Unusual" reached No. 1 on the UK Singles Chart in 1965 and was the first hit for Jones in the US, peaking at No. 10 in May 1965. Jones then performed the song on several different occasions on "The Ed Sullivan Show" in 1965. In April 1968, he returned to the show and sang it again.

Jones later used the song as the theme for his late 1960s–early 1970s TV musical variety series "This Is Tom Jones". It became his signature song.