"Swan" is a magnificent shōjo manga by Kyoko Ariyoshi that centers around ballet. The plot mostly follows a young girl, Masumi, as she struggles to become a ballerina.
Swan was published in North America by CMX. Because of the closure of the publishing company, only 15 of the 21 volumes were published. You can often find copies of Swan at conventions and specialty Japanese bookstores. If you cannot find Swan in your area, either order online or ask your local bookstore to carry it. PLEASE do not download Swan, as it hurts the possibility of the series being finished, and the other stories being published.
There are also two side stories, a magazine series, and a sequel. None of these have been published in English.
"Swan - Moscow Edition"
"Swan - Hakuchou no Inori", 2 volumes
"Maia - Swan Act II", 4 volumes. Published in Swan Magazine.