Question: what is considered the hardest song to sing?
Answer: "Unchained Melody" - The Righteous Brothers. This song is full vocal trills, dramatic pitch changes and dynamics. ... 
"My All" - Mariah Carey. ... 
The Star Spangled Banner. ... 
"Over the Rainbow" - Judy Garland. ... 
"I Will Always Love You" - Whitney Houston. ... 
"Chandelier" - Sia. ... 
"Lovin' You" - Minnie Riperton. ... 
"Wuthering Heights" - Kate Bush.