While Zoey is still in the hands of her kidnappers, the Bartlet
familyattends a private mass. Who composed the music for that segment
and where can I find it (either sheet music or CD)

Hello.

The composer is Lisa Gerrard. The piece is called "Sanvean." 


From Bartlet4america.org messageboard:

 'Anybody know what that amazing piece of music was playing in the
last scene as the Bartlet family was at Mass?
....
...the heightened New Age strains of Lisa Gerrard's "Sanvean" that
rubs our noses in emotional catharsis
..
If anyone else is interested, it's off her only solo CD to date, a
1995 endeavor titled "The Mirror Pool."'
http://pub15.ezboard.com/fbartlet4americafrm5.showMessage?topicID=83.topic

Also see:
West Wing Continuity Guide: Music On the Show
http://westwing.bewarne.com/questions/moremusic.html


As mentioned, "Sanvean" is Track # 4 on "The Mirror Pool" by Lisa
Gerrard, available from Amazon:
http://www.amazon.com/exec/obidos/tg/detail/-/B000002MYI/

Lisa Gerrard's web site:
http://www.lisagerrard.com/

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search strategy:
"west wing" zoey kidnappers

I hope this helps.