This song played in Season Ten's "Midnight".
 

This was playing toward the end of Season Eleven's "Damaged", as Carter gives Kem a call to tell her that he just wanted to hear her voice, as Neela escorts a patient on a train to comfort her, and as Abby deals with the death of a patient.
 

This was playing at the beginning of Season Eleven's "An Intern's Guide to the Galaxy".

This was playing at the beginning of Season Eleven's "Time of Death". 
 

This was playing in Season Eleven's "Back in the World". 
 

This was playing at the end of Season Eleven's "Back in the World" as Neela and Gallant were thinking of each other. 
 

This was playing at the end of Season Eleven's "The Show Must Go On" as Carter leaves the ER for the final time.

This was playing in Season Twelve's "Cañon City", as Luka and Sam were driving to Colorado to find Alex.  Sam wakes from a dream and tells Luka about what she had dreamed about.  Luka tells her how he lost his son.
 

This was playing at the end of Season Twelve's "Wake Up", as Luka was telling his patient about the day of her accident, as Abby was getting a mammogram, as Ray and Pratt were getting involved with some girls.

This was playing in Season Twelve's "Dream House", as Abby and Neela were tending to the chimp that Dr. Clemente had snuck into the ER.
 

This was playing at the end of Season Twelve's "Dream House", as Pratt was reading the letters that his estranged father had sent to his mother.

This was playing at the end of Season Twelve's "If Not Now", as Abby and Luka discuss keeping the baby.

This was playing at the end of Season Twelve's "Twenty-One Guns", as Abby and Luka are suffering the shootout in the ER.

This was playing during the Season 13 premiere "Bloodline" as Jerry and Abby are both being operated on.
 

This was playing at the end of Season 13's "Graduation Day" as Abby's mom is saying goodbye to Abby and her grandson.
 

This was playing at the beginning of Season 13's "Somebody to Love" as Morris is driving on the interstate with the top down on his convertible.
 

This was playing at the beginning of Season 13's "Parenthood" as Tony Gates is getting up for the day and in the kitchen.
 

This was playing during Season 13's "Scoop and Run" as Abby is flying around in the Paramedic Helicopter and also while Milo is listening to Abby's iPod.
 

This was playing at the end of Season 13's "Dying is Easy" as Abby is asking Luka to ask her to marry him again.
 

This was playing at the end of Season 13's "From Here to Paternity" as Pratt is speaking to Abby on his cell phone.  Also as Neela and Ray are kissing in his car as he is dropping her off at her place.
 

This was playing at the wedding ceremony of Abby and Luka during Season 13's "I Don't" as they dance their first dance as a married couple.

This was playing at the end of Season 13's "I Don't" as Ray is walking out of the bar and into the street as Neela is calling him on his cell phone.

This was playing at the end of Season 13's "I Don't" as Ray is being shown on Abby and Luka's wedding video talking about he can't wait to be as happy as Abby and Luka are.

This was playing at the end of Season 13's season finale "The Honeymoon Is Over" as Ray is being driven in the back of an ambulance with his mom back to her place and while Neela is driving down the road in the back of a cab and gets out to walk toward an anti-war demonstration.
 

This was playing during Season 14's "Owner of a Broken Heart" as Abby is having flashbacks of her and Luka.  These flashbacks consisted of different times from the past seasons, including their wedding ceremony, and Abby and Luka's first kiss.

This was playing at the end of Season 14's "Owner of a Broken Heart" as Tony Gates and Samantha Taggart "go at it" in Exam room 4.

This was playing at the end of Season 14's "Truth Will Out" right before Luka tells Abby that he will be moving out.

This was playing at the end of Season 15's "Haunted" when Ray was leaving and getting into his car as Neela watched from her apartment window.

This was playing at the ER Christmas party in Season 15's "The High Holiday".

This was playing at the end of Season 15's "The High Holiday" as we watch Sam and Alex, Morris and Neela, Dr. Banfield and her husband, and Tony.

This was playing during Season 15's "The Beginning of the End" when we see John Carter return and also during the end of the episode.

This was playing during Season 15's "I Feel Good" when Archie Morris walked in to Camp Del Corazon, a camp for kids who have had open heart surgery.

Archie Morris and Tony Gates sung this during Season 15's "I Feel Good" at Camp Del Corazon.