1. Adele: Adele is known for her powerful and soulful voice, often featured in slow and emotional ballads. Some of her most famous slow songs include "Someone Like You," "Hello," and "Rolling in the Deep."
2. Ed Sheeran: Ed Sheeran is another popular singer-songwriter known for his romantic slow songs. Some of his famous slow songs include "Thinking Out Loud," "Photograph," and "Perfect."
3. Taylor Swift: Taylor Swift is famous for her country and pop music, and many of her songs are slow and emotional ballads. Some of her famous slow songs include "All Too Well," "Back to December," and "Wildest Dreams."
4. Sam Smith: Sam Smith is a British singer and songwriter known for his soulful voice and slow songs. Some of his famous slow songs include "Stay with Me," "I'm Not the Only One," and "Writing's on the Wall."
5. Alicia Keys: Alicia Keys is an American singer-songwriter known for her powerful voice and soulful R&B songs. Some of her famous slow songs include "Fallin'," "No One," and "If I Ain't Got You."
6. Bruno Mars: Bruno Mars is a popular singer and songwriter known for his soulful voice and catchy songs. Many of his songs are slow and romantic ballads, including "When I Was Your Man," "Grenade," and "Just the Way You Are."
7. John Legend: John Legend is an American singer-songwriter known for his smooth voice and romantic songs. Some of his famous slow songs include "All of Me," "Ordinary People," and "Green Light."
8. Rihanna: Rihanna is a Barbadian singer and songwriter known for her versatile voice and chart-topping hits. Many of her songs are slow and romantic ballads, including "Umbrella," "Stay," and "Diamonds."
9. Justin Bieber: Justin Bieber is a Canadian singer and songwriter known for his pop music. Many of his songs are slow and romantic ballads, including "Sorry," "Love Yourself," and "Stay."
10. Coldplay: Coldplay is a British rock band known for their emotional and uplifting songs. Many of their songs are slow and melodic ballads, including "Yellow," "Clocks," and "Fix You."