Melanie Hamrick has been an undeniable force in American Ballet Theatre's corps de ballet for the past 15 years (16 if you count her time in the Studio Company, she points out). Her technical precision, combined with her luxurious quality of drawing each step out so that it melts into the next, has made her a standout whether she's dancing a featured role or in a corps of swans. On Saturday, she'll take her final bow with the company in Balanchine's Theme and Variations, with just a tiny bit of nerves. "I've always been a calm performer, but this fall season I've been quite nervous," she explained after rehearsal on Thursday. "I want to take in every moment and really enjoy it. I got quite emotional earlier this week because I'm going to miss my friends," she says, adding, "But I'm excited for the next chapter."