Recently acquired music service OD2 is adding nearly one million tracks to its music catalogue.

The additions transform the non-Mac-friendly company's music catalogue into the largest in the world, with 1.3 million tracks. The additions are "expected to take place later this year," the BBC reports.

The new songs arrive as a result of the company's recent acquisition by US firm, Loudeye.

Loudeye international business president (and former OD2 CEO) Charles Grimsdale said: "This deal will allow OD2 to reach US customers while allowing Loudeye to enter the European market."

OD2's sales climbed 28 per cent week by week after Apple launched iTunes Music Store in the UK, France and Germany.

"These results show the European market is entering a phase of explosive growth," said Grimsdale.