Released in 1979, two years after the classic Rumours, Tusk witnessed Fleetwood Mac engaging in typically high-end shenanigans by not only writing "experimental" pop songs but enough of them to make a double album.

History tells us Tusk cost more than $1 million to record, making it the most expensive rock record up to that year, but arriving after the brilliance of Rumours, selling Tusk in a similar fashion was nigh on impossible.

Stylistically it's all over the place – woeful songs such as Not That Funny lay beside gems like Sara, the adventurous title track and Think About Me. Its reputation has been calmed by perspective, but it remains a stretch to say it's a great record.

This ultra deluxe reissue, however, goes some way to making amends: specifically an alternate version of the album. Fans only need apply.