The song "All at Once" by Half Moon Run speaks about the fleeting nature of life and the impermanence of moments. The singer describes getting out of bed and taking the time to write, while also getting a little high. He then talks about feeling a dream coming in, and how things go as they may, indicating a certain surrender to the flow of life. The chorus, "It's just a moment in the sun, it's all gone fleeting all at once," emphasizes the idea that life is short and that even the best moments tend to pass quickly. The song then describes a romantic encounter, as the lovers take shelter under a canopy during a downpour. The narrator acknowledges that their relationship is wrong and can't be pursued, saying "I can't be your man." Overall, "All at Once" is a contemplative song that encourages listeners to appreciate the present moment while acknowledging that it's all temporary. The lyrics subtly suggest that there's beauty in impermanence and that perhaps we should enjoy things precisely because they're fleeting.