Duncan Sheik, the composer of the musical "Spring Awakening" and pop star known for the song "Barely Breathing," has died at the age of 56. His death was confirmed following a heart attack. Sheik, who won Tony and Grammy awards for his work, was celebrated for blending pop and theatrical music. His contributions to the musical "Spring Awakening" earned him critical acclaim and a dedicated fan base. The news of his passing has sparked tributes from fellow artists and fans around the world. Sheik's legacy continues through his music, which remains influential in both pop and theater circles.