Sophie Foundation is a nonprofit organization based in Chapel Hill, North Carolina, United States, which supports care for young adults with cancer at UNC Hospitals.

Its major event is an annual concert at Cat's Cradle, a music venue in the neighboring town of Carrboro.

In 2012, 14-year-old Sophie Steiner, a freshman at East Chapel Hill High School, was diagnosed with metastatic germ-cell cancer, and died ten months later on August 30, 2013.

And all of those, without exception, did not feel to Sophie like they were for her.Her sisters Annabel and Elsa, and her parents, Lucy and Niklaus Steiner, created Be Loud!

The first Cat's Cradle concert, in 2014, reunited the band Let's Active,[7][8] with the Pressure Boys headlining,[9] also featuring The Connells, the Dex Romweber Duo, and A Number of Things.

[12] At the 2016 event, performers included English Beat, Greg Humphreys' band Hobex, Chris Stamey's jazz group Occasional Shivers, Preeesh!, and others.

[16][17] In 2018, musical acts included Matthew Sweet, Surrender Human, the Sex Police, the Veldt, Collapsis, and the Right Profile.