What is the ideal volume setting?


As every CD seems vary in terms of maximum and minimum loudness, I find that I have to play a good ways into a disc before I find the ideal volume dial setting to get the most out of the music. This is very disconcerting as I usually have to start the disc all over after I find the best setting.  I wonder if anyone else experiences this.
I listen mostly to classical.  I don’t know if the same applies to other types of music. 
128x128rvpiano
It's easy enough to address this problem, but it will take some effort.  Rip each CD to a computer and use any one of the readily available audio programs to find the maximum recording level peak.  Set your volume for this peak level and mark each CD for future reference.  It should take less than 3 minutes per CD.
there should be a "calibration track" provided on the disk so we can set the "preferred listening level"

+1
Example: 1. Turn on your SPL meter. 2. Play the Calibration Track. 3. Adjust your volume until it reaches the specified SPL. 4. Enjoy the music the way the artist intended.