Roland has a collection of additional rhythms available for the BK-5.
Check out the complete collection here: http://www.rolandus.com/go/gw-7/
Click the PREVIEW button to listen to a short demo of the style.
Click the DOWNLOAD button to download the style to your computer.
Once you have downloaded a style file you will need to put it in the "My Rhythms" folder on a USB memory drive.
You must format a USB memory drive on the BK-5 before using it to store your additional Rhythms.