Yamaha offers regional and thematic expansion packs (e.g., Latin, Vintage Keyboard, Church & Christmas) for free to registered users. These often include both styles and high-quality "Voices".
Before downloading, ensure the file format matches your keyboard's requirements: Common Extensions : Look for SFF1 vs. SFF2 : Older models (e.g., Tyros 1/2, ) typically use Yamaha Psr Style Files Free Download