What's Going On is a concept album with most of its songs segueing into the next and has been categorized as a song cycle; the album ends with a reprise of the album's opening theme. The narrative established by the songs is told from the point of view of a Vietnam veteran returning to his home country to witness hatred, suffering, and injustice. Gaye's introspective lyrics explore themes of drug abuse, poverty, and the Vietnam War. He has also been credited with promoting awareness of ecological issues before the public outcry over them had become prominent. New, sealed.