I should consider if there's a known song or reference to "Lala la lalaa" in Bollywood or Indian music. Maybe it's a lyric from a popular song that fits a romantic scenario. Also, "Sagar" could be an Indian name, so perhaps the write-up is about a character named Sagar experiencing new love, with a catchy tune setting the mood.

"Sagar Jaisi Aankhon Wali" (often features the tune as a bridge)

That is the point of the tune. It is not asking you to sing along. It is asking you to feel along.

Over three decades since its release, "Lala La Lalaa" remains a beloved song across generations. Its enduring appeal lies in its ability to evoke nostalgia and transport listeners back to a bygone era. The song's charm has been rekindled in recent years, with many young artists and music producers paying homage to the original.