After 10 years away, it's safe to say that David Bowie had some creativity to spare. He issued a 14-track comeback album in March 2013 -- and then added five more songs for an expanded edition later in the fall. And he's not close to finished.

Tony Visconti, producer for 'The Next Day,' says there remain two or three additional songs from those sessions -- and they're not throwaways. In fact, he describes them as "astounding," adding that they too may see release.

That's big news for fans who pushed 'The Next Day' to gold-selling status in five countries, including the U.K. Bowie hadn't released any new music since the 'Heathen' album in 2003.

"We were very excited with the reaction," Visconti said, after accepting an honor on Bowie's behalf at the Music Producers Guild Awards. "No one believed that David Bowie was going to make another album and so the timing was perfect, because everyone kind of gave up on him. There were rumors of bad health and rumors of retirement, and I'm laughing my head off every time I hear them. I'm in the studio with a very healthy man who has no problem writing songs: He wrote easily 30 songs for that album."