"It's Not Unusual" is a song written by Les Reed and Gordon Mills, first recorded by a then-unknown Tom Jones,[4] after it had first been offered to Sandie Shaw.

The song was first aired on pirate radio in the UK, as the BBC rejected it because of Jones' sexual image.

[8] "It's Not Unusual" is the theme song of his late 1960s–early 1970s television musical variety series, This Is Tom Jones.

Jones's group, "Tom Jones and the Squires", were missing their regular keyboard player for the session, so Slade (a future member of Manfred Mann's Earth Band, AC/DC, and The Firm with Jimmy Page and Paul Rodgers) ran across the street to the "La Giaconda" coffee house, and recruited the then-unknown Reginald Dwight (who later adopted the stage name Elton John) for the one-day recording session.

The song enjoyed a resurgence in the mid-1990s, as it was used in the hit sitcom The Fresh Prince of Bel-Air on several occasions.