I just have to respond to this, even though I agree with 90% of it...
Use sound forge or similar and look at a remastered LP at the least, or a current recording... The results are a LOT of square waves that result from the misuse of plugin compressors or 'mastering' software.
There is a page on the subject at one of my WWW sites: http://www.mindspring.com/~mrichter/
Mike -- mrichter@xxxxxxx http://www.mrichter.com/