If you're unfamiliar with Penderecki, this CD is the best place to start. It contains his most (in)famous early work ("Threnody to the Victims of Hiroshima") as well as the best large orchestral piece I've yet heard from him (3rd Symphony).
"Threnody" remains one of the most radical and ear-lacerating sonic assaults ever created. Use it to wake up your loved ones, or clear unwanted guests out of the house. The other 2 "noise" pieces are more colorful but less concentrated.
The symphony is robust, lurid, and happily neo-romantic. The highlight is an eerily beautiful adagio which makes me think of wandering through a decaying garden under a full moon. I also like the propulsive, macabre scherzo-finale, which will make you wonder why nobody ever thought of using a scherzo for a finale before.
Once again Naxos puts the full-price labels to shame: adventurous music, terrific performances, good sound, and comprehensive notes, all for the price of lunch in a fast-food joint.