A greatest-hits album ought to stick to the middle of the road, playing to what an artist does best. Yet it ought not simply wallow in past glories: this collection from Russian soprano Anna Netrebko, arguably the best-known soprano of the present day, hits the spot and can safely be recommended to newcomers. Netrebko is at her best in core Italian repertory like Casta Diva from Bellini's Norma or Libiamo ne 'lieti calici from Verdi's La Traviata.