Which singer was featured in Swedish producer Avicii's song "Wake Me Up"?

Aloe Blacc was featured on Swedish producer Avicii's song "Wake Me Up" because his soulful and distinctive vocals captivated listeners and added depth to the track. Blacc's powerful voice perfectly complemented the catchy melody and uplifting message of the song, creating a unique blend of folk, electronic, and soul music that became a global hit. His collaboration with Avicii helped introduce his talents to a wider audience, making the song an instant success and further showcasing his versatile singing abilities.