AC/DC's High Voltage, released in 1975, is a classic hard rock album that showcases the band's raw, energetic, and blues-infused sound. It's considered a foundational album for the band, establishing their signature style of powerful riffs, gritty vocals, and straightforward rock and roll. The album features iconic tracks like "It's a Long Way to the Top (If You Wanna Rock 'n' Roll)" and "T.N.T.", and was a crucial step in their journey to becoming one of the most influential rock bands.