
John's listening habits at Kenwood were generally informed by his deep love of primal rock 'n' roll, R&B and soul, with a large side of Zimdon for good measure. During the psychedelic period, however, his tastes grew a little freakier, in keeping with everything else going on at the time. The account of the June 29, 1967 visit to the house includes the following: "John is very fond of putting on albums of noises these days, and one played constantly while I was there, broken only by bursts of "All You Need Is Love".
But what were these "albums of noises"? Frankly, I dunno.
One strong contender, though, must be the 1966 waxing Electronic Music, a compilation of early synth pioneers (including Walter (later Wendy) Carlos). John owned it, as the pic of him arriving at EMI studios in late February '67 shows.
The album itself is a bit of a period piece; specifically, the period before someone realised that synching the lower and higher end frequencies of these machines to repetitive (and preferably nosebleed-inducing) beats was a surefire way to get Ver Yoof doing Ver Twist (or somesuch).
The curious will find it freely available to download from various naughty sites.