Fans and critics have speculated on the meaning behind the title of Jay-Z and Kanye West's collaborative album 'Watch the Throne.' Some believe it's Hov and Yeezy's proclamation that they are the kings of the hip-hop throne. But according to Jay-Z, the regal title represents a call for artists to guard what he believe is the most sacred art form in music -- hip-hop.

"It's just protecting the music and the culture. It's people that's in the forefront of music, it's like Watch the Throne, protect it," Jigga told radio personality Lorenzo "Ice Tea" Thomas during his promotional stop in Miami. "You just watch how popular music shifts and how hip-hop has basically replaced rock and roll as the youth music. The same thing could happen to hip-hop, it could be replaced by other forms of music."

"So it's just making sure that we put that effort into making the best product so we can contend with all this other music, with all the dance music that's dominating the charts right now and indie music that's dominating the festivals and still hold off rock 'n' roll. Just to hold our place and make sure that the hip-hop culture is still the most dominant form of music around the world."

That shouldn't be a problem since 'Watch the Throne' reportedly has broke the US iTunes' seven-day sales record last week after selling nearly 290,000 downloads since Aug. 8. The album was sold exclusively through Apple's digital store until Aug. 12 when 'WTT' was available at both digital and brick-and-mortar stores. Jay-Z and West's album bested the previous record holder Coldplay when the group's 2008 album 'Viva La Vida Or Death and All His Friends' moved 288,000 total downloads in its first week, including sales from all other retailers.

Meanwhile, Jay-Z has announced that he will close out the first night of the iHeartRadio Music Festival, which is being held at the MGM Grand in Las Vegas on September 23-24. The rap king joins an impressive list of performers including Nicki Minaj, Usher, Lady Gaga, Jennifer Lopez, John Mayer, Bruno Mars, Carrie Underwood, Black Eyed Peas, Rascal Flatts, Alicia Keys, Sting and so many more.

Fans can cop tickets via Ticketmaster and those who are on a budget can win one of hundreds of free trips to the festival through iHeartRadio by listening to its stations and liking its Facebook page.