Carl Philipp Emanuel Bachs interest in the organ would seem to be fairly limited, at least judging by the number of pieces he composed for the instrument. The reasons for this attitude could be personal and professional, but could also reflect the changing affections and the new sensibility of the period, since during his lifetime the organ underwent a phase of relative decline. Indeed, following the acme reached by Johann Sebastian Bach, the instrument sank into a phase of neglect in Germany during the second half of the 1700s.
"…Walcha's…carefully calculated interpretations create a genuine sense of organic unity and a deeply musical sense of line and phrase, which gains from felicitous registration using highly suitable organs, splendidly recorded."– The Penguin Guide
This SACD from PentaTone was recorded originally in 1970, not long after he’d made his official debut as an organist. (His organ recitals are notable for being played from memory.) The performances were taken down in the then-new quadraphonic system & released on Philips LPs. But of course quadraphonic LPs were a less than ideal carrier for the 4ch sound on the tapes. Fortunately PentaTone, a company founded by ex-Philips personnel, has been reissuing quad recordings on SACDs remastered from those tapes & they sound spectacularly lifelike. They are, of course, in 4ch sound, not the 6ch that the modern SACD system is capable of.