Rosalina in the Observatory

"Rosalina in the Observatory" is a recurring musical theme that first appears in Super Mario Galaxy, where it serves as the background music for the Comet Observatory. It was one of two pieces composed by Koji Kondo for the game, the other being "Egg Planet" (Good Egg Galaxy's theme). Later uses and arrangements of the theme have been used to represent the Comet Observatory's ruler Rosalina.

Original
In Super Mario Galaxy, "Rosalina in the Observatory" changes as the player progresses through the game. There are three versions of the theme, and each version is more orchestral than the previous. The first version plays in the Comet Observatory until the player beats The Fiery Stronghold. The second version plays after beating The Fiery Stronghold until the player beats Darkness on the Horizon. The third and final version plays after the player beats Darkness on the Horizon.

Mario Tennis Open
An arrangement of "Rosalina in the Observatory" serves as the music for the Galaxy Arena court in Mario Tennis Open.

Super Smash Bros. for Wii U
Super Smash Bros. for Wii U features an arranged medley of "Rosalina in the Observatory" and "Luma" (also from Super Mario Galaxy) that can be played on the Mario Galaxy stage. It was arranged by Manami Kiyota, who previously composed themes for . The track returns in Super Smash Bros. Ultimate, where it can be played on any Super Smash Bros.- and Super Mario-series stage.

Mario Party 10
An arrangement of "Rosalina in the Observatory" titled "Rosalina's Theme" can be heard when Rosalina's amiibo is being controlled in amiibo Party in Mario Party 10.

Mario & Sonic at the Rio 2016 Olympic Games
An arrangement of "Rosalina in the Observatory" is available as a track in Mario & Sonic at the Rio 2016 Olympic Games.

Super Mario Odyssey
In Super Mario Odyssey, there is a musical Easter egg on the pause menu where when pausing and selecting options, a simple arrangement of "Rosalina in the Observatory" can be heard.

Mario + Rabbids Sparks of Hope
A music box arrangement of "Rosalina in the Observatory" plays in Mario + Rabbids Sparks of Hope when Rabbid Rosalina obtains a Purified Darkmess Energy Crystal. A music box rendition of the main melody's first three notes also plays when Rabbid Rosalina uses her Ennui move. An orchestral arrangement of the theme plays when Rabbid Rosalina is introduced in the game's cinematic trailer.