Following the disappointing commercial performance of the dance-oriented Hot Space in 1982, Queen took 1983 off to get refocused and work on a follow-up that would put the band back on track. While the songwriting had definitely improved on the resulting The Works in 1984, the album sonically lacked the punch of such earlier releases as News of the World and The Game (strangely, Hot Space even had a better overall sound)…
The vihuela is not a viol, it is a sort of lute. Vihuela and lute coexisted in Spain but the composers wrote only for the former. The works played in this recording were mainly published between 1535 and 1554; Daza's book (1576) and a collection of other authors (1593) mark the end of the era of the vihuela. Then the instrument lent its shape to the guitar, as you can infer from the cover of the CD.