The summer repeat season is in full effect, and tonight, Grey's Anatomy will air "The Heart of the Matter," at 9 p.m. This is the fourth episode from Season Four.

We've got all the action covered in our episode recap, as always. Grey's Anatomy Insider has a list of music selections, as well as our gallery and quotes.

There's also the Insider staff's entertaining round table from of the episode, and our forum, where you can discuss all things Grey's Anatomy with fellow fans!