Apple has acquired digital music service Lala, as the dominant online music retailer explores new models for selling songs.

Terms of the deal weren't disclosed by Apple (NASDAQ: APPL), which confirmed the purchase on Friday.

ITunes is the leading music service in the United States with more than 70 percent of all digital music sales and it is the leading music retailer overall. But newer music streaming services from the likes of News Corp's MySpace Music and Spotify have begun to win over music fans in the last year.

"Apple buys smaller technology companies from time to time and we generally do not comment on our purpose or plans," Apple spokesman Steve Dowling said.

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