The Beatles
or
Michael Jackson

(MJ..dig the Beatles but MJ has more songs that I love especially if you include J5 material)

Elvis
or
Frank Sinatra

(Can I choose neither? Ok if I had to it would be Elvis)

Prince
or
Rick James

(Prince)

Bob Dylan
or
The Rolling Stones

(Stones)

Earth, Wind & Fire
or
James Brown

(James)

Stevie Wonder
or
Jimi Hendrix

(Stevie)

Madonna
or
Janet Jackson

(Janet)

Hall & Oates
or
Mariah Carey

(Hall & Oates)

Bob Marley
or
Sly Stone

(Bob Marley)

Led Zeppelin
or
The Bee Gees

(Zeppelin)

The Beach Boys
or
Cameo

(Cameo)

Jay-Z
or
2Pac

(Pac)

The Commodores
or
The Isley Brothers

(Isley Brothers)

R Kelly
or
Maxwell

(Maxwell)

Parliament/Funkadelic
or
Marvin Gaye

(damn this is a tough one...I'll go with Pfunk..today)

Mint Condition
or
Jodeci

(Good one. I'd take Mint Condition live but Jodeci on record)

D'Angelo
or
Bobby Brown

(D'Angelo)

Elton John
or
Steely Dan

(Elton)

Kenny Rogers
or
Rod Stewart

(Rod Stewart)

Outkast
or
The Roots
(Similar to the Jodeci vs Mint one...I'd take The Roots live and Outkast's recorded music)