"Let It Happen" opens with a sense of urgency, as Parker sings about the overwhelming noise of life that surrounds him. The line "It's always around me, all this noise / But not nearly as loud as the voice saying / 'Let it happen, let it happen'" introduces the central theme of the song: the need to let go of control and allow life to unfold naturally. This repeated phrase serves as a mantra, urging both the artist and the listener to embrace the chaos rather than resist it.

As the song progresses, the lyrics reflect a deep inner turmoil, highlighting the struggle to break free from societal expectations and personal constraints. The imagery of running around and covering shadows suggests a desire to escape from the mundane and the pressures that weigh heavily on the individual. The urgency in the verses contrasts with the more reflective and contemplative nature of the chorus, creating a dynamic tension that resonates throughout the track.

The bridge introduces a transformative whirlwind, symbolizing the inevitable changes that life brings. Lines like "If my take-off fails, make up some other story, but if I never come back, tell my mother I'm sorry" touch on themes of mortality and the importance of living authentically. This acknowledgment of potential failure and the acceptance of consequences adds depth to the song, emphasizing the need to confront fears and embrace the unknown.

Musically, the song features an extended electronic breakdown that enhances its dream-like quality. The manipulation of vocals and the inclusion of gibberish in the latter half of the track create an immersive experience, allowing listeners to feel the emotional weight of the lyrics. The blend of psychedelic pop and rock elements further reinforces the theme of transformation, as the soundscape evolves and shifts, mirroring the journey of self-discovery.

Overall, "Let It Happen" serves as a powerful anthem for those grappling with change and the desire for personal growth. Its introspective yet uplifting atmosphere encourages listeners to confront their fears and embrace the flow of life, making it a resonant piece for anyone seeking meaning beyond the mundane.

Released in 2015, "Let It Happen" arrived at a time when many were grappling with rapid societal changes and personal challenges. The song's themes of acceptance and transformation resonate with a generation increasingly aware of the need to adapt to an ever-evolving world. The rise of electronic music and the blending of genres during this period also influenced the sound of the track, as artists sought to push boundaries and explore new sonic landscapes. Tame Impala, led by Kevin Parker, became a significant figure in this movement, merging psychedelic rock with modern electronic elements, which reflected the cultural zeitgeist of the mid-2010s.