Well, I dunno, that Revolution cover sounded pretty shallow. I never heard it before, but you forgot to erase the ID3 and anyone can see that it’s Elliot Smith when they play it in winamp. Let’s talk about Beatles. I think George Martin ruined Rubber Soul, and some other songs around that time – Day Tripper for example. That echo on left channel is horrible. I had a mono mix on A Collection of Oldies but Goldies and that sounded a bit better if I recall. I think if Joe Meek was their producer in those days, it would have been much better. They had some pretty good songs at the time 
I’m not sure if this is the reason for that reverb, but often the Capitol US office would add reverb to the stereo mixes sent over from England. They thought the sounds were too rough and needed to be sweetened up for the kids.
I grew up in Europe with original mixes. Day Tripper stereo mix has this reverb there too.
Taking it back. I just checked, The Past Masters version doesn’t have the reverb. Sorry Mr. Martin! Still – it sounds stupid with separated channels. What about Nowhere Man and In My Life? They might as well be put as vocal tracks only, I wish they had some guitar like in And Your Bird Can Sing or She Said. And that silly cartoonish piano solo on In My Life seems completely out of place.
Ok, now it really looks like I’m arguing here with myself, but actually, I was tricked by the crackling record. When you listen to Day Tripper on the headphones, the reveb is still there, on all versions of the song that I have here. If you have version without the reverb, please pass it over to me. I want to remix it.
The silly cartoonish piano was actually played at half speed and then sped up–George Martin wrote the part for it but couldn’t play it fast enough. A decent idea, but the speed change changed the tone as well, and I don’t know why they didn’t scrap it when they heard the results, or have someone else come in and play it.
Sir Martin was probably playing something like this…