"T.N.T." is a single released in 1976 by the hard rock band AC/DC, taken from their Australian album T.N.T. and the international version of High Voltage. The song was written by Bon Scott, Angus Young and Malcolm Young. It peaked at No.11 on the Australian Kent Music Report Singles Chart. A slightly modified line from the song, "Lock up your daughters", was used as the title of AC/DC's first headlining tour of Great Britain in 1976 after the band's move from Melbourne, Australia, to London, earlier that year. "T.N.T." later appeared on Live and the Live: 2 CD Collector's Edition, with Brian Johnson providing vocals.