1. Adele - Adele is a British singer-songwriter known for her powerful vocals and emotional ballads. She has achieved worldwide success with hits such as "Rolling in the Deep" and "Someone Like You."
2. Sam Smith - Sam Smith is a British singer known for his soulful voice and heartfelt lyrics. He has garnered success with songs like "Stay With Me" and "Too Good at Goodbyes."
3. Ed Sheeran - Ed Sheeran is an English singer-songwriter who has achieved massive success with his pop and folk-infused sound. Some of his well-known songs include "Shape of You" and "Thinking Out Loud."
4. John Legend - John Legend is an American singer-songwriter known for his smooth R&B sound and soulful ballads. He has released hits like "All of Me" and "Ordinary People."
5. Jason Mraz - Jason Mraz is an American singer-songwriter known for his acoustic and pop-rock sound. He has had success with songs like "I'm Yours" and "Lucky."
6. Bruno Mars - Bruno Mars is an American singer-songwriter known for his versatile sound that encompasses pop, R&B, and funk. He has had numerous hits such as "Just the Way You Are" and "Uptown Funk."
7. James Arthur - James Arthur is a British singer-songwriter who gained fame after winning the ninth season of The X Factor UK. He is known for his emotional ballads like "Impossible" and "Say You Won't Let Go."
8. Lewis Capaldi - Lewis Capaldi is a Scottish singer-songwriter known for his emotional and heartfelt ballads. He has achieved success with songs like "Someone You Loved" and "Before You Go."
9. Michael Bublé - Michael Bublé is a Canadian singer known for his smooth vocals and interpretations of classic pop standards. He has released hits like "Haven't Met You Yet" and "Feeling Good."
10. Robbie Williams - Robbie Williams is an English singer-songwriter known for his energetic performances and pop-rock sound. He has had success with songs like "Angels" and "Rock DJ."