This week's book giveaway is in the Performance forum. We're giving away four copies of The Java Performance Companion and have Charlie Hunt, Monica Beckwith, Poonam Parhar, & Bengt Rutisson on-line! See this thread for details.
There are no classes in the standard API to play sounds, except the very weak AudioClip class in the java.applet package (which works only in browser/appletviewer environments.) To do anything "real" with sound, you need to use the Java Media Framework (JMF) API. See here for info about JMF.