Sales through Apple's iTunes Music Store have surpassed 300 million, the company announced today, and the download rate is climbing.

The company also revealed that the iTunes-exclusive Tsunami benefit record, 'Across the Universe' (written by John Lennon and Paul McCartney and performed by a cabal of Grammy Awards winners, including U2's Bono, Steve Wonder, Norah Jones and Alicia Keys) debuted at number 22 on the Billboard Hot 100 Singles chart. This made the track, "the most successful exclusive digital track ever in its first week of release", the company said.

An exuberant Apple vice president of applications Eddy Cue said: "We're honored to offer "Across the Universe" exclusively on the iTunes Music Store with all proceeds going to tsunami survivors and their families."

It was only on January 24 2005 that Apple revealed it had achieved 250 million sales. "iTunes users are now downloading one and a quarter million songs per day, which is an annual run rate of almost half a billion songs per year," the company then said.

“When we launched the iTunes Music Store we were hoping to sell a million songs in the first six months—now we’re selling over a million songs every day, and we’ve sold over a quarter billion songs in total,” Apple’s CEO Steve Jobs said at the time.

The company has now sold an additional 50 million tracks - the equivalent of 1.35 million tracks each day, or one and a third million tracks each day.