It's one thing to have a hit song that captures the social zeitgeist. But when said tune still packs a punch decades later — that’s a rarity. Such is the case for Aussie singer Helen Reddy’s most well-known single, “I Am Woman.” The 1972 No. 1 hit co-written with Ray Burton became feminism’s most powerful musical call to arms. “I think it came along at the right time. I’d gotten involved in the women’s movement, and there were a lot of songs on the radio about being weak and being dainty,” she told The Chicago Tribune last year. “All the women in my family, they were strong women. They worked. They lived through the Depression and a world war. I certainly didn’t see myself as being dainty.” In accepting a Grammy Award for her performance, Reddy made a point of thanking a feminine deity “because she makes all things possible.” Of course, Reddy scored a number of other hits she’s likely to revisit — “Delta Dawn,” “Angie Baby” and “You and Me Against the World.” After nearly a decade’s hiatus from regular live performing, Reddy is opening a U.S. tour in Houston.