Thanks to the music therapy team at UCLA Mattel Children's Hospital in Los Angeles, one family has a special memory of their eight-year-old daughter that she helped create before she died.
Before Jackie Glaz's daughter passed away, a team of music specialists at the hospital put together a special song featuring the sound of the brave little girl's heartbeat.
"That was our big thing for us - memories, things that we could take with us forever," Jackie said.
"I know she's watching us but we needed something."
Watch the video above for the heartbreaking story.