Michael Jackson's Unreleased Songs, Continuing the Music Legacy

July 17 2009— -- In the weeks after Michael Jackson's death, his No. 1 hits have been blasted in car stereos, retail stores and public memorials. And industry experts say Jackson may continue to burn up the charts with a reported a stash of unreleased music that could earn his estate millions.

"What we have seen happen in the last three weeks is that the albums that are out here right now are selling in amazing numbers," Jim Henke, curator of the Rock and Roll Hall of Fame, told "Good Morning America." "I think we are going to see amazing interest in any released Michael Jackson material that will come out in the future or a year from now on."

Jackson died June 25 of apparent cardiac arrest at his rented Los Angeles home. Since his death, his albums and singles have rocketed to the top of the charts once again.

Many stores have sold out of every title, unable to keep up with demand. And iTunes reported a massive spike in interest, with Jackson songs taking up nearly all the online music store's top 10 spots.

He wouldn't be the first chart-topping entertainer to release posthumous material. John Lennon did it with "Woman," released a month after he was murdered in 1980. Otis Redding's "Dock of the Bay" became a hit just weeks after his death in 1967.

And a string of Tupac albums have been released since the rapper was gunned down more than a decade ago.

TMZ unearthed a portion of a unreleased Jackson track called "A Place With No Name," possibly his take on the song "A Horse with No Name" by America.

There are reportedly many more songs Jackson recorded, now sitting in a vault, that could eventually be releasec .

"Michael was a creative artist, and he was always experimenting and changing, and really breaking the boundaries," Henke said.