The song "Rainbow Magic" by Rosanna Pansino is a fun and catchy tune that is centered around the theme of creating a unicorn cake with rainbow magic. The song is based on Pansino's popular YouTube baking series called "Nerdy Nummies" where she creates various themed treats. In the song, Pansino expresses her excitement and love for unicorns, stating that they are her sister's favorite animal and are known for their magical qualities. She emphasizes that anything related to unicorns, such as unicorn frappuccinos, cookies, and headbands, makes everything better. Pansino then goes on to explain the process of making a unicorn cake, describing it as a funfetti cake with a unicorn face. She highlights the importance of adding rainbow magic to the cake, indicating that the cake party wouldn't be complete without it. The lyrics also touch upon the idea of narwhals, referring to them as the unicorns of the sea. Pansino mentions that when they grow up, they resemble cookies and cream. This is a playful comparison, adding to the magical and whimsical theme of the song. Overall, the song "Rainbow Magic" is a joyful celebration of unicorns and the joy they bring. It is a light-hearted and fun anthem that captures the imagination and creativity of Pansino's baking world.