"It's Not Unusual" is a song written by Les Reed and Gordon Mills, first recorded by a then-unknown Tom Jones, after having first been offered to Sandie Shaw. 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 himself. Jones later used this song as the theme for his late 1960s–early 1970s television musical variety series This Is Tom Jones. It has since become his signature song.