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Here you can find 2 styles that you can download for free. The styles are only bass and drums. They can be downloaded along with 2 standards that go well with these styles.
Here you can find 3 Soundfont files that you can download for free. They all contain an Upright Bass and Brush Drums and a piano.
The sounds are not HD audio quality, but still sound great. The content is based on freely available sounds on the web.
Go to pgmusic.com for more info on how to use soundfonts. Or check this little slideshow: