Sir Elton John is to make his back catalogue available for digital download, he announced today.

The collection spans four decades and comprises more than 400 tracks.

"I've wanted my music to be available for digital download worldwide for some time, but I knew that the entire catalogue - not just the hits - needed care and attention to be released in this way," Sir Elton said.

"Now that it's happening, I'm pleased for the fans' sake.

"The world has certainly changed since Philips Records issued my first single on seven-inch vinyl - 39 years ago this month."

The catalogue begins with Sir Elton's 1969 debut album Empty Sky and includes the likes of Goodbye Yellow Brick Road, Honky Chateau, Captain Fantastic And The Brown Dirt Cowboy and Made In England.

The star is also making his biggest hits available as mobile phone ringtones.

And a selection of his most famous video clips, including I'm Still Standing and Don't Go Breaking My Heart with Kiki Dee, will be issued through digital music services.

The music catalogue will be available from March 26. Until April 30 it will be available exclusively from iTunes.

It coincides with the release of his new compilation album, Rocket man - The Definitive Hits.

Sir Elton has sold 200 million albums during his career.

This weekend he will perform at New York's Madison Square Garden to celebrate his 60th birthday.