Quadruple Certification

In my research, I have come across very few music artists who have achieved quadruple certification requisites - Gold, Platinum, Multi-Platinum, and Diamond.  On Wikipedia, however, there is a brief list of artists who have.

RIAA Recap -
Gold Requisite - 500,000
Platinum Requisite - 1,000,000
Multi-Platinum Requisite - 2,000,000+
Diamond Requisite - 10,000,000

- The Coveted List -

AC/DC 
Gold 22...Platinum 20... Multi-Platinum 12...Diamond 1

Aerosmith 
Gold 25...Platinum 18...Multi-Platinum 12...Diamond 1

The Beatles 
Gold 48...Platinum 42...Multi-Platinum 26...Diamond 6

Bee Gees
Gold 15...Platinum 9...Multi-Platinum 2...Diamond 1

Garth Brooks
Gold 21...Platinum 21...Multi-Platinum 15...Diamond 7

Mariah Carey
Gold 15...Platinum 13...Multi-Platinum 9...Diamond 2

Brittney Spears
Gold 9...Platinum 8...Multi-Platinum 4...Diamond 2

Eric Clapton
Gold 23...Platinum 11...Multi-Platinum 7...Diamond 1

John Denver
Gold 21...Platinum 13...Multi-Platinum 7...Diamond 1

Celine Dion
Gold 13...Platinum 11...Multi-Platinum...8...Diamond 2

The Doors 
Gold 20...Platinum 14...Multi-Platinum 5...Diamond 1

Eminem
Gold 11...Platinum 9...Multi-Platinum 8...Diamond 2

Michael Jackson
Gold 15...Platinum 30...Multi-Platinum 9...Diamond 2

Billy Joel
Gold 18...Platinum 17...Multi-Platinum 12...Diamond 2

Elton John
Gold 37...Platinum 27...Multi-Platinum 12...Diamond 1

Kenny G
Gold 15...Platinum 11...Multi-Platinum 8...Diamond 1

Led Zepplin
Gold 19...Platinum 18...Multi-Platinum 14...Diamond 5

Madonna
Gold 20...Platinum 17...Multi-Platinum 12...Diamond 2

Tom Petty
Gold 15...Platinum 8...Multi-Platinum 5...Diamond 1

Pink Floyd
Gold 19...Platinum 15...Multi-Platinum 12...Diamond 2

Elvis Presley
Gold 90...Platinum 52...Multi-Platinum 25...Diamond 1

Prince
Gold 18...Platinum 11...Multi-Platinum 4...Diamond 1

Kenny Rogers
Gold 28...Platinum 17...Multi-Platinum 7...Diamond 1

The Rolling Stones
Gold 43...Platinum 28...Multi-Platinum 11...Diamond 1

Santana 
Gold 21...Platinum 10...Multi-Platinum 7...Diamond 1

Bruce Springsteen
Gold 22...Platinum 17...Multi-Platinum 10...Diamond 2

James Taylor
Gold 20...Platinum 14...Multi-Platinum 5...Diamond 1

U2
Gold 16...Platinum 16...Multi-Platinum 11...Diamond 1