Sienna Spiro, 20-year-old singer from London, has become a major new star in pop, with her debut performance at Los Angeles' Troubadour in March at the age of 20. She has since become known for her ballad "Die on This Hill," a ballad that has become her signature since its release in 2025, reaching the top 20 of the Billboard Hot 100 and in dozens of countries worldwide. The song has been used in 1.1 million videos on TikTok and has been hailed as a generational talent. Spiro credits credits from Miley Cyrus' "Flowers" to Rosé and Bruno Mars' "Apt." and Omer Fedi and Michael Pollack. She discusses her journey to fame and success in her short discography, which includes 13 ballads in her discography.