- Zoe Keating - Exurgency plays as Sherlock finds Butch Callahan's camera in a dumpster.
- Claudine - Ofai Tere plays as Sherlock views the wall of evidence of Gerald Talt.
- At Potter and Talt's property, after Watson traipses to the edge and back, she jokingly reports to Holmes that she found nothing, not even a smoke monster, referencing the TV show Lost.
|Elementary Season Four Episodes|
|The Past Is Parent • Evidence of Things Not Seen • Tag, You're Me • All My Exes Live in Essex • The Games Underfoot • The Cost of Doing Business • Miss Taken • A Burden of Blood • Murder Ex Machina • Alma Matters • Down Where the Dead Delight • A View with a Room • A Study in Charlotte • Who Is That Masked Man? • Up to Heaven and Down to Hell • Hounded • You've Got Me, Who's Got You? • Ready or Not • All In • Art Imitates Art • Ain't Nothing Like the Real Thing • Turn It Upside Down • The Invisible Hand • A Difference in Kind|
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