The song "Summer" by Calvin Harris tells the story of a romance that begins during the summertime. The lyrics describe the moment when the protagonist meets their love interest, and how they instantly fall in love to the sound of their own heartbeat. As the relationship progresses, the leaves turn brown, indicating that summer is coming to an end. The protagonist expresses the desire to be together with their love interest as long as the skies are blue, suggesting that they want the relationship to last. However, there is a hint of betrayal in the lyrics, as the love interest initially portrays themselves as innocent but eventually reveals that they have lied. Overall, the song captures the essence of a passionate summer romance, blending themes of love, excitement, and potential heartbreak. Despite the bittersweet elements, the upbeat energy in the music and catchy chorus create a sense of nostalgia and longing for the carefree days of summer love.