Yamaha Styles and The Yamaha Style Explorer
Yamaha Styles are MIDI files that contain loops designed for Yamaha Instruments. Turbo Play can import to midi tracks those loops and transpose them using the Yamaha Style File options.
Most yamaha style fils contain "main" sections, "intro" sections, "fill in" sections and "ending" sections. Using the Yamaha Style Explorer you can first scan for those files (in the same way you would scan for VSTs) and then they are available for import.
YS importing allows you to select what section to import, how to transpose it, and optionally filter some of the MIDI channels.