Neil Diamond
Donovan
Bryan Ferry
Billy Joel
Gordon Lightfoot
Cat Stevens
more if I think about it . . .

All of them are 'favourites'?
That's like having 50 favourite flavours of ice cream

Prince
Babyface
Keith Sweat
Al B. sure!
Usher
Phil Collins
Lionel Richie
Billy Ocean
Luther Vandross
Peabo Bryson
James Ingram
George Michael
Michael Bolton
Michael McDonald
Michael Jackson
Howard Jones
"Arnold, my love, why must I worship youand NEVER EVER tell?"

Marvin Gaye
Luther Vandross
Bill Withers
Maxwell
D'Angelo
Anthony Hamilton
Don't
eva
let nobody tell you you ain't
strong enough

Otis Gibbs
Billy Bragg
Tim Barry
Paul Baribeau
In terms of solo rappers there's far too many to list but a few would be:
Sean Price
KRS-One
Big K.R.I.T.
Brother Ali
Z-Ro
Busdriver
Freeway
Slick Rick
Pharoahe Monch
Ghostface
Masta Ace
P.O.S.
Scarface

Alice Cooper
Eric Clapton
Elton John
Peter Gabriel
Phil Collins
Tom Petty
Steve Miller
Ozzy Osbourne
Ronnie James Dio
Neil Young
John Mellencamp
Slipknot and My Little Pony: Friendship Is Magic fan

The following are my most favorite. (smiles)
James Otto
Trace Adkins
Darryl Worley
Brad Paisley
Toby Keith
Kenny Chesney
Hal Ketchum
God bless you and them always!!!
Holly
P.S. My newest favorite is also a male singer, Billy Joe Royal that is, but sadly the beautiful precious isn't here anymore. I do love him anyway. If only I had discovered him before his going forward last October. (burying my head)
Check out my most favorite singer, James Otto, when you can! I love him SO much!!! (smiles)

OP's list is way too long, imo. Cant have that many favorites.
Mine are probably
David Bowie
Neil Young
Bob Dylan
"When life presents you with lemons, squeeze out the juice and squirt it in your enemies eyes."

Donnie Iris had these singles
Ah! Leah! (1981)
Love is like a rock (1982)
My girl (1982)
Do you compute? (1983)

Donnie Iris
Seriously? Didn't he only have one song? No Aldo Nova?

Donnie Iris
Cliff Richard
Boz Scaggs
Todd Rundgren
Billy Joel

Rockers:
Bowie
Springsteen
Neil Young
Frank Zappa
Jeff Rosenstock
Rappers:
Ghostface Killah
MF DOOM
P.O.S
El-P
Chance the Rapper
Vince Staples
Danny Brown
Kendrick Lamar
Tell me more!

Howard Shore
Neil Young
Peter Gabriel
Bob Dylan

Elvis Costello (though best with the Attractions - first 5 albums only)
Linton Kwesi Johnson
Neil Young
Paul Simon
Peter Gabriel
Cat Stevens
Prince
Lucky Dube
Loudon Wainwright III
Pepe-Kalle
Bob Dylan
Peter Tosh
Joe Jackson (first two albums)
Tom Petty (though best with the Heartbreakers)
Billy Idol
David Bowie
John Lennon
Matisyahu
Marvin Gaye
Fela Kuti
Bad Hombres and the Nasty Woman - now playing at your 70s porn sleaze palace

Iggy Pop
David Bowie
Townes Van Zandt
Mark Lanegan
Mike Johnson
Serge Gainsbourg
Jacques Dutronc
Normal Is A Myth.