One Republic caused a major "Awwww" moment recently when they released their latest single, "Feel Again": the song samples sounds of actual heartbeats from children in Malawi and Guatemala. In association with the Ad Council and Save the Children, proceeds from the song go to Every Beat Matters, an organization dedicated to delivering lifesaving healthcare to children in need throughout the world. What a great twofer — the song is also really catchy.

Now, get a sneak peek into how lead singer Ryan Tedder incorporated the heartbeats into the making of "Feel Again" in the video above. Spoiler alert: You're gonna need some new mascara.