YA Quartet: Ballet.

Books in which ballet figures in prominently:

  

Bunheads is about 19-year-old Hannah Ward, who, due to her talent and extremely hard work, is a senior corps member with the Manhattan Ballet. Just as her career really begins to take off, she starts dating... and ultimately realizes that she's going to have to pick one or the other. If you're looking for a behind-the-scenes look at the ballet world, this is the one.

Various Positions, meanwhile, is about 14-year-old Georgia Slade. She's a student at the Royal Toronto Ballet Academy. While there is, of course, a whole lot of ballet in this one, the focus is actually much more on Georgia's somewhat confused feelings about sex and about her sexual awakening... which involves one of her instructors. The writing is quite lovely, but be prepared for some seriously uncomfortable moments.

  

A Company of Swans is just as delightful as any other of Eva Ibbotson's romance novels, but this one's about a girl in a ballet company. Charming to the max.

Eva, one of the two heroines in Jersey Tomatoes are the Best, is a ballerina. (Her best friend, Henry, is a tennis player.) While Various Positions and Bunheads both deal with eating disorders tangentially, the focus of Eva's storyline is on her struggle with anorexia.

Others? There must be more...