The song "Knockin' On My Heart" by Kelsey K is about a moment of nostalgia and reminiscing about a past love. The rain and puddles on the ground serve as a metaphor for the tears and emotions that come with thinking about this person. The lyrics describe a teenage romance, with the speaker falling in love at 15 and experiencing their first kiss. The chorus, "Just keep Knockin' on my Heart Knock Knockin' on my Heart Knock Knockin' on my Heart don't stop," indicates that despite the pain and memories associated with this past love, the speaker is still open to the possibility of reconnecting or finding love again. The verse about the stars coming out and feeling like "glowing through the speakers" suggests that music is a powerful tool for expressing emotions and connecting with someone else. Overall, "Knockin' On My Heart" is a wistful and romantic song about looking back on a teenage love and the lasting impact it had on the speaker.