No Final Fantasy Versus XIII themes for Theatrhythm Final Fantasy this week, but Square Enix does have some classic themes lined up. Here's the DLC lineup that's due out on the 18th, along with music samples from the official site.
FF1 -- 海底神殿 / Forgotten Temple of the Deep (Field Stage)
FFV -- バトル1 / Battle 1 (Battle Stage)
FFX -- 萌動 / Movement in Green (Field Stage)
FFXII -- 死闘 / Shitou (Battle Stage)