These two works form a perfect, contrasting pairing of the two most sublime piano compositions for four hands in existence: the Mozart ineffably sunny yet majestic, in a brilliant D major, the Schubert Fantasia achingly melancholy and beautiful, played by two musicians who are characterised by expressive understatement. In my experience, Lupu has since, in later years, become inclined to give detached, almost indifferent performances which verge on the remote, whereas here he and Perahia play with both strength and delicacy without ever giving in to excessive rubato or cheap, overt emotionalism.
This is a live performance from the Maltings, Snape, but you could listen quite intently without noticing that. The recording is very close, so there is a slightly claustrophobic effect which is more pronounced but not entirely inappropriate to the Schubert and results in any extraneous noise from the audience being excluded. This original issue is undoubtedly short measure; if that troubles you the later, more expensive 2003 reissue comes with an additional twenty minutes of music by Mozart in the form of his K 401 Variations and the K608 Fantasia, but to me that's like slathering caviar with ketchup; these two pieces form a perfect programme and anything else is de trop.
A rank amateur like me cannot be the first person to have noticed the link between the opening theme of Schubert's D 940 - so meltingly reprised at 13' 40" and again right at the close at 18' 22" - and the melody of Barbarina's cavatina which opens Act 4 of "The Marriage of Figaro". Both are in F minor, the key Mozart associated with ironic grief, although of course Schubert mutates it into the major and then a mock-Baroque fugal passage. The Fantasia has a wonderful unity and a sense of stately progress aided by the measured tempi adopted by Perahia and Lupu - slower than most but never dragging, just grand. No wonder that this disc has never been out of the catalogue.