High Voltage' is the first internationally released studio album by AC/DC. It contains tracks from their first two previous Australia-only issued albums, 'High Voltage' and 'T.N.T.' (both from 1975). Originally released internationally on 30 April 1976 on Atlantic Records and in the US on 14 May 1976, this edition of 'High Voltage' has proven popular, selling three million units in the US alone. However, initially the album was panned by some critics upon its release, including a review by Rolling Stone magazine's Billy Altman that called it an "all-time low" for the hard rock genre.