In January 1978, AC/DC was riding a wave of success with their album "Let There Be Rock," which had been released just months earlier in Australia and was set for international release shortly thereafter. This period marked a transformational phase for the band, as they were gaining a larger following following their prior album "High Voltage." Their performance of "Sin City" on "The Midnight Special" highlighted their energetic live presence and the burgeoning hard rock scene. The show was significant as it showcased vocalist Bon Scott, who was known for his charismatic stage presence and unique vocal style. The band's relentless touring and promotional efforts during this time helped solidify their reputation as one of the premier live acts, paving the way for their eventual breakthrough in the United States. This performance is not only a glimpse into their live dynamics but also a critical moment in their early history, preceding their rise to global fame.