Myles,
I think your point is well taken that in the early days of stereo recording there was a steep learning curve and a whole lot of ping pong nonsense from one channel to the other and a void in the center. On the other hand, maybe this problem was more pronounced at some studios than others. On the 1959 recording, Kind of Blue (Columbia), we hear Miles Davis in the middle, John Coltrane in the left channel, and Cannonball Adderley in the right channel. The piano, bass and drums spread across the back stage from left to right. Several Brubeck records (Columbia) from that era have similar spacing with Desmond generally front and center. MJQ (Atlantic) generally had natural spacing too with Jackson front right, and Lewis front left most of the time. You have me thinking of re-listening to a lot of records now, as though I needed an excuse ;-). Thanks!