Warner Music Group has issued fourth-quarter and full-year results that show strong digital revenue gains for the 12 months up to Sept. 30.

Although digital revenue grew by a modest 0.6% from the previous 2008 quarter to $167 million, that represents a 28% increase from the prior year quarter. WMG's full-year digital revenue increased 39% to $639 million, 18% of total revenue.

For the three months ending Sept. 30, the New York-based major's total revenue was $854 million, a decrease of 1.5% from the same period in 2007 and 5.2% down on a constant currency basis. The full-year revenue increased by 3.2% to $3.49 billion, or 2% down on a constant currency basis.

Operating income from continuing operations fell by 20.5% over the three months to $66 million, while the full-year figure was $207 million, down 8% from $228 million. Operating income before depreciation and amortization (OIBDA) from continuing operations was $475 million for the full-year, up from $474 million for the 2007 fiscal year.

Profit for the quarter rose 20% on the previous three months from $5 million to $6 million, while the corresponding net income for the full year was a loss of $56 million, widening from $21 million in 2007.

"WMG had a strong year, outperforming the industry, and sustaining revenue and OIBDA over the fiscal year, despite the challenging global recorded music and broader financial environments," said chairman and CEO Edgar Bronfman in a statement. "We remain confident in our ability to execute on our long-term goals, given that we continue to advance our strategy to lead the industry transformation by pursuing innovative business models, diversifying revenue streams and investing in A&R."

In the fourth quarter, domestic revenue declined 5.4% to $420 million, while international revenue grew 3.7% to $443 million, though declined 4.1% on a constant currency basis. The full-year figures show a 3.9% decline in domestic revenue to $1.6 billion, while international revenue climbed 10.3% to $1.91 billion, a 0.5% decline on constant currency levels.

Quarterly recorded music operating income from continuing operations fell 22.2% to $56 million; the OIBDA recorded music figure for the quarter was $100 million, down 13.8%. Major sellers for the three months included albums from Kid Rock, Metallica and T.I.

For the fiscal year, recorded music revenue grew 2.1% to $2.89 billion, although that was a 2.8% decline on constant currency basis. Recorded music operating income from continuing operations for the year dropped 6.4% to $233 million; the OIBDA full-year figure was a fall of 1.2% to $416 million.