- Jet-Star and the Kobra Kid / Traffic Report by My Chemical Romance prod. by My Chemical Romance & Rob Cavallo
- Juarez prod. by Doug McKean
- Juarez/Bury me in black by Zombie Seattle
- Kid Nothing (Unreleased Track) prod. by Doug McKean
- Kill All Your Friends by My Chemical Romance prod. by My Chemical Romance & Rob Cavallo
- Kill All Your Friends (Live Demo) by My Chemical Romance prod. by My Chemical Romance & Rob Cavallo
- Kill the Music by Every Time I Die prod. by The Machine
- Kiss the Ring by My Chemical Romance prod. by Brendan O'Brien
- Knives/Sorrow (Demo) by My Chemical Romance prod. by Geoff Rickly
- Last track on spaghetti by Zek The Spaghetti Man (Ft. Dave Grohl) prod. by Bert McCracken
- Look Alive, Sunshine by My Chemical Romance prod. by My Chemical Romance & Rob Cavallo
- Louder Than Your Love by Andy Black prod. by John Feldmann
- Make Room!!!! by My Chemical Romance prod. by Brendan O'Brien & My Chemical Romance
- Mama by My Chemical Romance (Ft. Liza Minnelli) prod. by My Chemical Romance & Rob Cavallo
- Mama (Live Demo) by My Chemical Romance
- Mama (Live From Mexico) by My Chemical Romance prod. by Jennifer Destiny Rothlein
- Mastas of Ravenkroft by My Chemical Romance prod. by My Chemical Romance
- Mata a tus amigos (Kill all your Friends-Spanish Adaptation) by Zombie Seattle
- Maya The Psychic prod. by Doug McKean
- Millions prod. by Doug McKean