Tusk is the twelfth studio album by the British and American rock band Fleetwood Mac, released as a double album on 12 October 1979 in the United States and on 19 October 1979 in the United Kingdom by Warner Bros. Records. It is considered more experimental than their previous albums, partly as a consequence of Lindsey Buckingham's sparser songwriting arrangements and the influence of post-punk. The production costs were initially estimated to be about $1 million but many years later were revealed to be about $1.4 million (equivalent to $6.21 million in 2025), making it the most expensive rock album recorded to that date.