[ 12.01 ]     "Cañon City"

Smokey Robinson - Tracks From My Tears [ Lyrics ]
Luka and Sam driving to Colorado to find Alex

Brenda Lee - Emotions [ Lyrics ]
Played at the end

  [ 12.03 ]     "Man with No Name"

The Fray - Over My Head (Cable Car) [ Lyrics ]
Abby and Luke are in the pub together and when Neela comes home and finds Ray with a new girlfriend

  [ 12.05 ]     "Wake Up"

James Blunt - You're Beautiful [ Lyrics ]
Last scene with Luka, Abby, and Clemente

  [ 12.06 ]     "Dream House"

Harry Nilson - Coconut [ Lyrics ]
Abby and Neela treat a gorilla

Amos Lee - Seen it All Before [ Lyrics ]
Pratt is reading the letters from his mother in the train

  [ 12.09 ]     "I Do"

Barry Manilow - Copacabana [ Lyrics ]
Luka singing in the car

Barry Manilow - Can't Smile Without You [ Lyrics ]
Morris and Kerry drinking

  [ 12.10 ]     "All About Christmas Eve"

Yvette Freeman - Have Yourself a Merry Little Christmas [ Lyrics ]
Played at the end

  [ 12.11 ]     "If Not Now"

Damien Rice - Cold Water [ Lyrics ]
Abby tells Luka she wants to keep the baby

  [ 12.14 ]     "Quintessence of Dust"

Instrumental - Many Rivers to Cross [ Lyrics ]
Patient playing the piano at the bar

  [ 12.15 ]     "Darfur"

Lucious - Knocking on Heaven's Door [ Lyrics ]
Debbie driving the jeep

  [ 12.18 ]     "Strange Bedfellows"

Cary Brothers - Ride [ Lyrics ]
Neela and Ray are talking by the cab at the very end

  [ 12.19 ]     "No Place to Hide"

The Beach Boys - California Girls [ Lyrics ]
Debbie is waiting for Pratt at the airport

Sonny and Cher - I Got You Babe [ Lyrics ]
Debbie and Pratt singing in the car

  [ 12.20 ]     "There Are No Angels Here"

Abdel Gadir Salim & Emmanuel Jal - Gua [ Lyrics ]
When Dr. Dakarai comes back

  [ 12.21 ]     "The Gallant Hero and The Tragic Victor"

Kanye West - Gold Digger [ Lyrics ]
Scene

  [ 12.22 ]     "Strange Bedfellows"

Snow Patrol - Open Your Eyes [ Lyrics ]
Played at the end

*** I'd like to thank everyone who's helped me with this list.

Michael Colvin, Kitchen_Sink5, Lisa Esemplare, Abi, Ali, Ali H, Amy, Andrew, Anja, Aurelie, Becky, Beth, Bladez37, Carlie, Carrie, Catherine, Cathy, Cecilia, Celine, Daryl Ann, Dawn, Diane, DJ -Sn|per-, Dorothy, Eddy, Elizabeth, Elliott, Gayle, Gemma, Genevieve, Giampaolo, Ginger, Guest, Heather, Honor, J, Jamie Leah, Jason, Jen, Jenn  O, Jenny, Jessie, John, Jules, K. Peet, KatMac, Kayleigh, Kelly, Kimmi, Kingston Fan, Kira, Kitty, Kris, Kristen, Kristina, Lara, Lara W, Laura, Laura, Lauren, Laurent, Lene, Lesley, Lindsay, Lionors, littleone, Lori, Lou Ann, Lou Noah, Mara, Marianthe, Martha, Mathieu, Maya, Megan, Mel, Melanie, Melissa, Mich, Morgan, Nelson, Nikkii, Noa, Paul, Rachel D., Rachel, Raymond, Robin, Rosalyn, Sagwise, Sam, Sara, Scott, Sebastián, Sidney, Smish, Stef, Stephanie, Steve, Sydney, Sue, SugarComaxo, Tom, Tracy, Tyler Glenn, Vivi, Wendy, Woody Jones, Yvette, zigzag, Jean and Mari from the Carter-Abby-LukaFans group, and everyone at the WB ER messageboard (circa 1999-2000)

for providing many upon many song names, lyrics help, scene descriptions, and even mp3s at times.