Someone in London is a song by the heavy metal

Heavy metal music

Heavy metal is a genre of rock music that developed in the late 1960s and early 1970s, largely in the Midlands of the United Kingdom and the United States...

 band Godsmack

Godsmack

Godsmack is an American heavy metal band from Lawrence, Massachusetts, formed in 1995. The band is composed of founder, frontman and songwriter Sully Erna, guitarist Tony Rombola, bassist Robbie Merrill, and drummer Shannon Larkin...

 from their debut studio album Godsmack

Godsmack (album)

-Controversy:The album caused controversy due to its profane lyrics without a Parental Advisory Label. After listening to his son's copy of the album, a father in the U.S. complained to Wal-Mart, who sold him the album, that the lyrics were offensive. Wal-Mart and Kmart took the album off the...

 and this is an instrumental interlude. It's the only music on the album that lead singer Sully Erna

Sully Erna

Salvatore Paul "Sully" Erna , is an American vocalist and primary songwriter for the American heavy metal band, Godsmack. Erna is also a guitarist and drummer, performing these both on albums and during live shows. He has a daughter named Skylar Brooke Erna and an older sister named Maria.-Early...

 had no part in writing. It was written by guitarist Tony Rombola

Tony Rombola

Tony Rombola is an American musician who has been the lead guitarist for the Boston-based heavy metal band Godsmack since the mid-1990s...

.

Song comment

"Mind the big gap" is what is repeated at the beginning. It is repeated over the speakers in the London underground to warn their passengers of the gap between the train and the platform edge.