12-12-12 Sandy Relief Concert: Photos From Onstage & Backstage
Bruce Springsteen and Jon Bon Jovi greet the audience at the beginning of NYC's 12-12-12 Concert for Sandy Relief at Madison Square Garden.

The pre-orders continue to come in for the "12-12-12 The Concert for Sandy Relief" album. Industry sources say that through the close of business on Thursday night (Dec. 13), iTunes' pre-orders for the set numbered around 50,000.

Through the evening before that -- the night of the superstar-filled concert -- there were about 40,000 pre-orders registered.

'12-12-12' Album Sales at 40,000 in Pre-Orders

The Columbia Records album is currently scheduled to be released on Tuesday, Dec. 18 -- though there is a chance it could hit iTunes over the Dec. 15-16 weekend. A tracklist for the album has yet to be made public, though it's assumed that it will feature at least 24 selections. That's the number of tracks advertised on its iTunes pre-order page at the present, though that number could change.

More than 50 songs were played at the show, held at New York's Madison Square Garden. Acts ranging from Bruce Springsteen and Paul McCartney to Kanye West and Alicia Keys participated in the nearly six-hour concert to raise money for Hurricane Sandy relief.

12-12-12: 12 Things You Didn't See at the Sandy Concert

The album will impact Billboard's charts once it has been delivered to customers, so, pre-orders will only count once the album has actually been downloaded by the end-users. (That also means that not necessarily all of the so-far 50,000 pre-orders will ultimately be fulfilled.)

If the album goes live in iTunes before the close of business on Sunday, Dec. 16 (the last day of the current Nielsen SoundScan sales tracking week), then the set could impact the new Billboard 200 revealed on Wednesday, Dec. 19. If it arrives on Monday, Dec. 17, then it will debut on the following week's tallies.