Jay-Z, Kanye West's Watch the Throne Called 'Instant Classic'

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Fans tout the new collaboration, released on iTunes Monday, on Twitter.

Jay-Z and Kanye West's Watch the Throne was released on iTunes Monday. Hours later, it shot to No. 1 on iTunes albums sales charts in 23 countries, including the U.S., Australia, Mexico and New Zealand.

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Fans took to Twitter to hail the collaboration as an "instant classic."

Reactions included:

RamiBeatz, "man that watch the throne is a instant classic."

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EddySteezRYD, "Watch The Throne" is an instant classic! nobody can tell me different.

Passionweiss," Seriously though, Watch the Throne makes the Sistine Chapel look like a work of subtle minimalism."

AustinRivers25, "WATCH THE THRONE IS THE BEST ALBUM of the year!! One of the greatest! Lol seriously

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itsthecalm, "WTT drops...Dow falls 600 + points. I guess people were actually Watching The Throne."

sedwardskc, "Watch the Throne" may be too intricate and intimate for most. Def on some next level ish. Repeat listenings required...

agentbizzle, "this Watch the Throne album is SO MUCH BETTER if you picture Jay/Kanye scuffling over the "throne" like two ADORABLE RAPPING SEA LIONS AWW

I_Am_Nigh, "Watch The Throne Is real illumanati Like Lol #ReallyTho"

Beyonce, RZA and Q-Tip are among the contributors on the album.

Jay-Z and West’s 17-date tour kicks off Oct. 29 in Atlanta.

Jay-Z tried to downplay reports of tension between him and his protege on NYC radio station Hot 97 last week.

"Kanye's my brother," he said, before admitting, "Yes we get on each other's nerves. That's part of pushing each other. ... People don't like to be pushed. It's annoying. ... So of course there are times when we're in the studio, we're yelling, but that's about it."