"Lock and Key" is a song written, produced and performed by Canadian rock band Rush. It is a promotional single from their twelfth studio album, Hold Your Fire. The song deals with the theme of every human being’s primal, violent instincts underneath their civil appearance - their “killer instinct”. Critics gave the song liking reviews, with some saying it had quality of a hit single, and would make it on the Billboard Hot Mainstream Rock Tracks chart; it went on to reach number 16 on the chart. The song's music video was originally released in 1987, and was produced by Bob Jason and directed by T. Vanden Ende.