In what year was the album “Blue Lines” released by Massive Attack?

In what year was the album “Blue Lines” released by Massive Attack?: The album “Blue Lines” was released in 1991 by Massive Attack, featuring 9 tracks.
What is the most successful song from the album “Blue Lines” by Massive Attack?: “Unfinished Sympathy” is the biggest hit from the album “Blue Lines” by Massive Attack.

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