Yoshinori Monta with Junko Ohashi -- Natsu Onna Sonia（夏女ソニア）

Woof! Now this would make a great theme song for a show about a tough-as-nails female police officer. But instead, "Natsu Onna Sonia" (Summer Woman Sonia) was used as the campaign song for Kose Cosmetics. And there was quite the powerhouse vocal duo behind this jingle with the sonic boomer of Junko Ohashi（大橋純子）and the raspy-voiced Yoshinori Monta (もんたよしのり), leader of Monta & Brothers（もんた&ブラザーズ）who had the No. 1 song of the year in 1980, "Dancing All Night"（ダンシング・オールナイト）.

Released in April 1983 as a special duet number, "Natsu Onna Sonia" was written by Yu Aku（阿久悠）and composed by singer-guitarist Fujimal Yoshino（芳野藤丸）. It gallops at a fast pace, but it also has a nice if very brief slower passage handled by Ohashi before things go back to full speed. I wouldn't have minded if that passage had been extended a bit more since I'm a fan of Ohashi and that voice of hers. Still, it's a nostalgic and dynamic reminder of some of that Japanese disco sound from the 1980s and even the decade before that. The song got as high as No. 16 on Oricon.