Rubáiyát is a 2CD compilation album, released in 1990 to commemorate the 40th anniversary of the Elektra Records record label. The concept was to feature present-day Elektra artists covering 40 songs from the historic catalogue of recordings of Elektra Records and its sister label Asylum Records.
The retail version is 2 CDs with just the 40 cover versions. I have the 4 CD promotional version which includes 2 more CDs with all 40 of the original versions as well.