What is Sailor Moon theme songs called?

There are actually many Sailor Moon theme songs, but the most well-known and iconic one is called "Moonlight Densetsu" (月光伝説), which translates to "Legend of the Moonlit Night."

This song is the opening theme for the original 1992 anime series. There are also many other theme songs throughout the different Sailor Moon series and movies, including:

* "Moon Pride" (ムーンプライド), the opening theme for *Sailor Moon Crystal*.

* "Eternal Snow" (エターナルスノー), the ending theme for *Sailor Moon Crystal*.

* "La Soldier" (ラ・ソルジェ), the opening theme for *Sailor Moon R*.

* "Tuxedo Mirage" (タキシード・ミラージュ), the opening theme for *Sailor Moon S*.

* "Girls' Beat" (ガールズビート), the opening theme for *Sailor Moon SuperS*.

The specific song you're referring to might depend on which version of Sailor Moon you are watching or listening to.