New York's Metropolitan Opera has made 100 operas from its back catalogue available online through the digital music service Rhapsody.

Performances by sopranos Maria Callas, Beverly Sills, Birgit Nilsson and Renata Tebaldi, and tenors Luciano Pavarotti, Placido Domingo, Franco Corelli and Richard Tucker are available in digital audio formats.

Fans can download individual tracks or whole operas such as Mozart's Le Nozze de Figaro or Bizet's Carmen from a range of recordings dating from 1937 to 2006.

A Rhapsody Unlimited subscription is US$12.99 per month and prices for individual tracks vary, the Met said.

The Met is also issuing DVDs of Tchaikovsky's Eugene Onegin with Dmitri Hvorostovsky, Renee Fleming and Ramon Vargas, and Bellini's I Puritani with Anna Netrebko.

The DVDs are of operas from its first series of high-definition broadcasts last year, a popular event that brought opera lovers to cinemas throughout North America.

The DVDs, created with Universal Classics, will be available Dec. 18.

The Met's second season of high-definition broadcasts starts Dec. 15, with Gounod's Roméo et Juliette.