For those that are interested in that sort of thing, the music is available for download from Quest Studios (in game soundtracks).

http://www.queststudios.com/

Other Sierra game music is available there too!

Quest Studios is an utterly outstanding website. It's given me hours upon hours of high quality renditions of so many of my favourite soundtracks. I often listen to these soundtracks while playing entirely different games, and in my car on the way to work.

Police Quest has particularly thoughtful and urban-sounding music which sound especially great with high quality MIDI hardware.

My only complaint is the ID3 tags on the files. It's sloppily arranged.

Aside from that, Quest Studios is fabulous.

Note that you can get the manuals and hint books along with a ton of other cool stuff of ALL Sierra classics from http://www.sierragamers.com. The official site by Ken and Roberta Williams.