Download and install HammerHead Rhythm Station. This free software features 29 built-in drum sounds and allows you to place sounds on up to six different channels.
Purchase FL Studio. As of June 2010, the most current version is FL Studio 9. This application is a more robust way to create music beats and allows you to use drum loops as well as other instruments. Using FL Studio 9, you could create an entire song.
Buy and install Magix Music Maker. This program is similar to FL Studio 9 in that it allows you to go beyond simple drum-based beats. You can add many other types of instruments to your Music Maker project and even export your results to MP3.