She has written the Valdemar series (a HUGE lot of books, split in several trilogies - and her writing got better with every new book), and the Bardic voices series, plus a lot of other books (I haven't read them all).
Among the Valdemar books, you have to start with the "Arrows" trilogy - not the best, but you have to if you want to understand the rest of the series. The "Wind" trilogy is positively brilliant. I am currently re-reading "By the sword" for the 3rd time - one of my favourites.
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The world is my oyster !