Some things are for historical reasons. The strict composer scheme is sometimes a problem, if you have multiple composers on one CD. I put those in a "Various" folder, not a problem, because fb2k's search functions rock anyway.
Examples:
M:\Music\Classical\Sibelius\Symphonies\Complete Cycles\Blomstedt - SFSO\No.1\1.01. Allegro ma non troppo.tak
M:\Music\Classical\Sibelius\Symphonies\Complete Cycles\Blomstedt - SFSO\No.5\4.02. Andante mosso, quasi allegretto.tak
M:\Music\Classical\Sibelius\The Wood Nymph\Vänskä - LSO\The wood nymph.tak
My file names only have DISCNUMBER,TRACKNUMBER and the track name. File names are not important for me, only their order has to be correct (because on my notebook I navigate folder-wise)
I wouldn't create too long filenames because very soon you get file system/access problems.
Typical tagging I use:
Artist : Jean Sibelius
Composer : Jean Sibelius
Title : Andante mosso, quasi allegretto
Album : The Symphonies
Work : Symphony No. 5
Conductor : Herbert Blomstedt
Ensemble : San Francisco Symphony
Performer :
Date : 2006
Track Number : 2
Total Tracks : 3
Disc Number : 4
Total Discs : 4
Comment : Recording Location: Davies Symphony Hall, San Francisco (...)
Genre : Classical
Label : Decca
Original Cuesheet :
Most important for me is the consistent use of %work%, %conductor%, %composer% and %ensemble%.