You can find the full soundtrack listing for this specific episode on Tunefind .

Episode Discussion - S15E18 - “Add It Up” : r/greysanatomy

The episode (Grey's Anatomy Season 15, Episode 18) features several key musical pieces that accompany its major storylines, such as the introduction of hospital "mood rooms". The primary songs featured in this episode include: "Do Your Worst" by Rival Sons . "Run to You" by Ocie Elliott . "When You Were Young" by Benjamin Francis Leftwich .