Released in 1999 on the album Gulong Itlog Gulong, "Kailan Pa?" is a defining track by the Filipino rock band Parokya Ni Edgar. The song exemplifies the group's signature blend of pop rock with introspective lyrics that resonate deeply with Filipino audiences. Known for its melodic structure and emotional depth, the recording became a staple in the band's discography during the late 1990s. It reflects the era's musical landscape where rock music gained significant traction in the Philippines, often addressing themes of longing and uncertainty. The track remains a popular choice for live performances and has cemented the band's legacy as pioneers of modern Philippine rock.