"Counterpoint" is a collection of standalone vignettes, each inspired by the song from which it takes its title. There will eventually be one for each squadmate, plus some other major crew members. Timeframe varies from backstory to any of the three games, in no particular chronological order. All the songs can be found on YouTube—I recommend listening while you read.
Here are the songs I plan to use for each character so far.
Counterpoint
Playlist
Commander Shepard: "Wrong Side of Heaven" –Five Finger Death Punch
Zaeed Massani: "Heroes" –Shinedown
Legion: "My Last Breath" –Evanescence
Samara: "Angels Fall" –Breaking Benjamin
Tali'Zorah vas Normandy: "All I Ever Wanted" –Shinedown
Mordin Solus: "This is War" –Thirty Seconds to Mars
Garrus Vakarian: "I Stand Alone" –Godsmack
Miranda Lawson: "For My Sake" –Shinedown
Urdnot Grunt: "Riot" –Three Days Grace
Jacob Taylor: "Awake and Alive" –Skillet
Thane Krios: "Forever My Infinity" –Sully Erna
Jack: "Sweet Sacrifice" –Evanescence
Kasumi Goto: "Misfits" –Shinedown
Urdnot Wrex: "Rise" –Skillet
Liara T'Soni: "Broken Pieces" –Apocalyptica
Ashley Williams: "When Angels Fly Away" –Cold
Kaiden Alenko: "Call Me" –Shinedown
EDI: "Bring Me to Life" –Evanescence
Javik: "Indestructible" –Disturbed
James Vega: "Feel Invincible" –Skillet
Steven Cortez: "Ashes of Eden" –Breaking Benjamin
Dr. Karin Chakwas: "Lean On Me" –Bill Withers
Jeff "Joker" Moreau: "Magic Carpet Ride" –Steppenwolf