Sienna Spiro, is an English singer-songwriter. Known for her distinct deep contralto voice, she began sharing viral singing videos on TikTok in 2022. She started releasing music in 2024, including "Maybe", which became her debut on the UK Singles Chart. She released Sink Now, Swim Later, her debut extended play, in February 2025. Her breakthrough success came with the release of "Die on This Hill", which charted in numerous countries.