What viral hit did Zach Sobiech release that gained significant popularity?

Zach Sobiech released the viral hit "Clouds," which gained significant popularity largely due to its poignant lyrics and emotional resonance. The song was inspired by Sobiech's battle with osteosarcoma, a type of bone cancer, which he faced during his teenage years. As he approached the end of his life, “Clouds” became a way for him to express his feelings about love, loss, and the importance of living life to the fullest despite challenges. The song's message touched many people and was widely shared, helping it to gain traction on social media platforms and inspiring a documentary that further highlighted his story and music. This emotional connection, coupled with its catchy melody, allowed "Clouds" to stand out and make a lasting impact.