It's a lovely touch, especially for one of the most lovable of all composers.
Schubert's gentle march-like theme, tinged with passing melancholies, is spun through all manner of delicious decoration, although the seventh variation is more serious.
Check it out at 11'12" and be astounded at how three minutes of poignant enchantment are drawn from just 29 bars of score, admittedly with the assistance of some extraordinary harmonic writing.
The high point must be Argerich and Barenboim fronting up to Stravinsky's The Rite of Spring on two powerhouse Steinways -- a brave venture, with a work that made history through the piquant colours and visceral power of its orchestration.
One misses that signature bassoon at the opening but, as textures coalesce, one can hear just how much Stravinsky was influenced by contemporary French music -- ironically Debussy himself played this transcription with its composer in 1913.
Argerich, on the second piano, draws some terrifying sonorities from her instrument, especially when the chosen victim is being celebrated. Yet there is also room for chilling simplicity before a wild Sacrificial Dance that sounds as if we are being thrust decades ahead into the manic soundworld of Conlon Nancarrow's Player Piano Etudes.
Verdict:
Piano legends in superlative form on one and two keyboards.