to bring the list to date (and BTW -- thanks for posting links for the vocalists who may not be household names 

 and even as a reminder for the better known names 

  ):
1. Frank Sinatra
2. Glenn Danzig (who did you think I would list first? )
3. Denny Doherty
4. Elvis (especially when singing gospel)
5. Roy Orbison
6. Johnny Cash
7. Bruce Dickinson
8. Brian Wilson
9. FREDDY MERCURY
10. Nick Lowe
11. James Alan Hetfield 
12. Sam Cooke
13. Jerry Vale
14. Tenor CS
15. Nat King Cole
16. the Mills Brothers
17. Dalles Green
18. Marvin Gaye
19. Josh Groban
20. Phillipe Wynne
21. Stevie Wonder
22. Smokey Robinson
23. Eddie Kendricks
24. Chris Cornell 
25. Lyle Lovett 
26. Michael Crawford 
27. Dean Martin
28. Bing Crosby
29. Perry Como
30. Andrea Boccelli
31. Maynard of Tool
32. Neil Diamond 
33. Van Morrison
34. Bob Dylan
35. David Coverdale
36. Roger Daltrey
37. Daryll Hall
38. Levi Stubbs 
39. David Ruffin 
40. Otis Redding
41. Thom Yorke 
42. Adam Duritz 
43. Art Alexakis 
44. Paul Rodgers
45. George Strait 
46. Michael Buble
47. Mel Torme
48. Al Green
49. Barry White
50. Big Al Carlson 
51. Michael Jackson
52. Seal
54. Muddy Waters
55. Johnny Hartman
56. Peter Criss
57. Ronnie James Dio
58. Axl Roxe
59. Joe Cocker
60. Luther Vandross
61. Elton John
62. K.Angylus
63. Steve Von Till
64. Michael Gira
65. Ray Charles 
66. Aaron Neville
67. Hank (Williams) 3
68. George Benson
69. Art Garfunkel 
70. Billy Eckstine
71. Lou Rawls 
72. David Clayton Thomas 
73. Johnny James Dio
74. Geoff Tate
75. Robert Plant