For much of the 1970s, Little House on the Prairie was a mainstay of prime-time television and remains an iconic series. It also gave Melissa Gilbert the role with which she will always be identified – spunky little Half-Pint, Laura Ingalls. Now, some 28 years after Little House went off the air, Gilbert returns to familiar territory — this time as the matriarch of the Ingalls clan. But that’s not the only twist: The mild frontier will also be alive with the sound of music in – what else – Little House on the Prairie: The Musical. (What — Prairie! was too obvious?)  Instead of going back to Walnut Grove, the creators of this show have sent the plucky pioneers to