iTunes Library - Playlist

[Robert Salter]

I just noticed that if I check (check mark) or un-check a song in my 
library, the same action takes plays for that same song in my 
corresponding Playlist (where I have added that particular song). And 
the same holds true for the song in the Playlist - if I check or 
unchecked the song in my Playlist, that same song is now checked or 
unchecked in the Library.

I recently upgraded iTunes to version 4.01 (117) and started using an 
iPod. I seem to recall that prior to these two changes/additions, my 
Library and Playlist were independent from one another as it 
pertained to the check or un-check feature?

Now, if I want to play the songs in one of my Playlists I have to 
select/check mark each song - which also check marks that same 
song(s) in my Library - so, for example if I just want to listen to 
our Christmas songs in the Playlist, I now have all the Christmas 
songs "checked" for play in the Library.

I'll have to un-check the Christmas songs so they won't play in the 
master Library.

I hope I made myself somewhat clear and would appreciate any 
suggestions and/or comments. Thank You.