"No Good at Saying Sorry (One More Chance)" by The Early November
Album:
Release Date:
Grey's Anatomy Episode: 5x20 - Meredith sticks up for an abused child and the chief gets angry. Lexie wants Mark to meet her father and he finally agrees. Owen tries to stay away from Cristina because he's no good for her. And Izzie's mom comes after Bailey calls her.

"What a Difference a Day Makes" by Cory Lee
Album:What a Difference a Day Makes
Release Date: July 26, 2005
Grey's Anatomy Episode: 5x21 - Meredith and Derek give their wedding up for Izzie and Alex.

"Here's to Future Days" by Thompson Twins
Album:Here's to the Future Days
Release Date: September 17, 1985
Grey's Anatomy Episode: 5x22 - Owen has trouble facing things after Iraq. Mark wants Lexie to move in. Meredith suggests she and Derek go to City Hall to get married. George enlists in the Army. Webber and Arizona both want Bailey to go into their speciality. Izzie decides to go with Derek's surgery on her new tumor.

"Now or Never" by Three Days Grace
Grey's Anatomy Episode: 5x23 - Derek and Meredith get married via Post-It Note. George is brought to the hospital after being dragged by a bus.