Def Leppard's debut album, "On Through The Night," released on March 14, 1980, under UMC (Universal Music Catalogue), is a high-energy blend of glam metal, glam rock, and classic rock that showcases the band's early sound and raw talent. With a runtime of 44 minutes, the album features 11 tracks, including the iconic "Hello America" and the powerful "Rock Brigade." The album's title track, "On Through The Night," sets the tone for the record, with its driving rhythm and soaring vocals. Def Leppard's signature harmonies and Joe Elliott's distinctive voice are prominent throughout, making this album a standout in their discography. "On Through The Night" is a testament to Def Leppard's ability to craft catchy, hard-hitting rock songs that resonate with fans of the genre.