Grey's Anatomy - Season 4, Episode 17: Soundtracks

Wyatt tells Mer to figure it out herself; Derek is stressed; George tells Lexie she didn't do him a favor by telling him his test results; Alex yells at Izzie when she tries to help with Rebecca.

Derek reveals too much to Rose; Richard lets Cristina save cement boy's life; Derek and Beth have a moment before surgery; Cristina tells Hahn to back off.

Richard apologizes to Mer; Mark pushes Callie towards Hahn; Derek and Mer search for each other; Richard tells Adele he's coming home; George thanks Lexie; Alex breaks down in Izzie's arms.

Mer builds a house of candles on Derek's land. They kiss, but Derek leaves so that he can break up with Rose first. He tells Mer to wait for him.

Richard apologizes to Mer; Mark pushes Callie towards Hahn; Derek and Mer search for each other; Richard tells Adele he's coming home; George thanks Lexie; Alex breaks down in Izzie's arms.