I have a friend who swears that Feldman's music is narcotic. I don't know if I'd go that far...for me it certainly isn't soporiphic, but it is deeply addicting. And Piano and String Quartet is perhaps the most addicting piece I've heard from Morty. I know why Feldman was interested in daunting length because I never want this work to end.
Feldman is a minimalist in the most natural sense...like Mondrian or Rothko in painting, or Robert Creely in poetry, or Becket in Theater. Feldman's minimalism is based on limiting the means of composition and leaving space on his sonic canvas. (as opposed to Reich, Riley and Glass who limit musical means but then cover the page with their patterns. It's what a friend of mine calls energy minimalism.) In the case of Piano and String Quartet, the basic musical means are easily described. The quartet play delicately balanced chords, while the piano plays ethereal fillagrees...arpeggios and crystalline chords, all at very low volume levels (the piece never gets louder than piano). Each iteration of this material arises from silence and recedes back into the silence. It sounds profoundly natural, like waves of sound. The musical language is lush and haunting...neither tonal or atonal, but something that floats in between. (Another big difference between Feldman and the minimalist school is that Feldman's harmonic sense is more complex...and may have actually had some influence on later developments in minimalism, particularly on Reich's more chromatic music of the 80's onwards.)
The real art of this piece is in the details. Though the basic compositional form stays rather static throughout the piece, there is never a literal repeat. Each new statement of the material changes in small but, in the context, monumental ways. The chords change slowly and subtley, the piano goes from aprpeggios to solid chords. The string halo of harmony changes in weight and register, the rhythms (meticulously written out by Feldman...there is no rubato here...Feldman wrote it all in)make subtle changes both in durations of notes and of the rests and silences. Anything that breaks the pattern is significant. In this context, when the cello enters with a pizzacato passage about half way into the piece, the effect is shattering.
I can't exactly describe the effect of this on me...it's meditative but not like Part...it's more like something that makes me intensely aware of the beauty of the individual moment (the ecstasy of the moment in Morty's words) The effect is curiously autumnal, like late Brahms. You feel it almost as an ache in the heart at the beauty and frailty of the passing world. (Sorry this is so nebulous, but late Feldman seems to inspire such poetic musings, I find.)
The performance on this disc is about as perfect as you can find. Feldman's music is notoriously difficult to perform. (I've tried to play some of the early piano pieces myself and they are fiendish, even though they don't sound it.) The difficulties are not really technical...this isn't Liszt or Paganini. But the sustained concentration for the performer is unbelievable. No measure is exactly the same in rhythm, and you have to count like mad. The results on this Cd however are sublime. You are not aware of the effort of the performers, just the waves of sound floating in and out of consciouness. And Takahashi is sublime. There isn't a bad note in the performance. (Incidentally, I belong to a listserve on Feldman and, though members can rarely agree on anything else, this album always gets the highest rate of reccomendation.)
Like others here, I'd hesitate to recommend this to newcomers to Feldman's work. Better to listen to Rothko Chapel or the Tilson Thomas Coptic Light recording. In both cases the works on the discs are only at most a half an hour long...Piano and String Quartet clocks in at almost 80 minutes. But once you get hooked on Feldman you'll want to explore this work, which I think is one of Feldman's most ravishing and strongest. (And once you graduate from this one, you may want to tackle the new Hat Art recording of String Quartet No. 2 which is breathtaking and runs over 4 hours!)