I must say, it's very good background music for working on things. Only, now I'm going to have the opening bars of the theme in my head all night.
The work in question is an audition notice, amongst other stuff. Auditions are this coming week, so if you know anyone interested in Shakespeare's Twelfth Night, please send them to http://hartwellplayers.org.au/Plays/TwelfthNight.
EDIT: Another CD from the library is Bliss N Eso's Flying Colours. As I wrote this post, a track was playing that samples the same bars from the Harry Potter theme.