After an award-winning stint at the Midtown International Theatre Festival in 2008 and a sold-out run at Queens Theatre in the Park last year, this good-natured celebration of Greek culture is back for a five-week run at the Hellenic Cultural Center in Astoria, Queens, which any New Yorker knows is a huge and thriving Greek-American neighborhood. The story is simple and old-fashioned and gets pretty silly, but that's all part of its lighthearted spirit. The Greek palace guard, arriving on a fictional Greek island looking for recruits, breaks up a love triangle; off goes manly Manos to the mainland, with shy, good-hearted Costa trailing along. When Sophia turns up in Athens only to be jilted by her hometown lover, she settles for second best. Big mistake? Act II will tell. The primary key to the show's success is the music, by the late Hollywood composer Nicholas Carras and musical director/pianist Elise Morris. A harmonious mix of light-modern staccato rhythms, big Broadway-style harmonies, and Mediterranean flavors, it is well matched by concise, clever lyrics.