It is an absolute sin that Tudor’s “Romeo and Juliet” has fallen out of repertory. Made in 1943 for American Ballet Theatre on Alicia Markova and Hugh Laing, this one act version uses music by Delius instead of the more familiar and bombastic Prokofiev. At this point, there’s some question, hotly and loudly debated, whether the Tudor can be fully recovered. ABT presented a short duet of Romeo’s farewell to Juliet. It wasn’t built to be a self-contained excerpt, but still, if the duet was any indication of the whole ballet’s quality, it’s exquisite.