The greatest singing voices of all time 1 of 31. Barbra Streisand. Kevin Mazur/Getty Images for BSB. ... 2 of 31. Etta James. Charles Paul Harris/Michael Ochs Archives/Getty Images. ... 3 of 31. Aretha Franklin. ... 4 of 31. Whitney Houston. ... 5 of 31. Mariah Carey. ... 6 of 31. Elton John. ... 7 of 31. Freddie Mercury. ... 8 of 31. Adele. More items... 2 days ago