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Azzurro
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Its most famous version was recorded by Adriano Celentano in 1968.
Adriano Celentano
Adriano Celentano (born 6 January 1938) is an Italian vocalist, musician, producer, comedian, actor, film director and TV host.
He is dubbed il Molleggiato (the flexible one) because of his dancing.
Celentano has released many record albums which have enjoyed enormous commercial and critical success.
He is often credited as the author of both the music and lyrics of his songs, although, according to his wife Claudia Mori, sometimes they were written in collaboration with others.
Due to his prolific career and great success, both in Italy and the rest of the world, he is considered one of the pillars of Italian music.
Celentano is also recognized for being particularly perceptive of changes in the music business.
He is credited for having introduced Rock'n'Roll to Italy – a genre that had great appeal on young people of that time.
As an actor, Celentano has appeared in about 40 films, mostly comedies.
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His granddaughter is the spouse of Manaf Tlass.
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Gertrude of Bavaria
Gertrude of Saxony and Bavaria( 1152/55–1197) was Duchess of Swabia as the spouse of Duke Frederick IV, and Queen of Denmark as the spouse of King Canute VI.
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He is the former spouse of the group's current leader, Maryam Rajavi, whom he divorced so that she could become the spouse of Massoud Rajavi.
Billy Milano
Billy Milano is a Bronx- born heavy metal musician now based in Austin, Texas.
He is the singer and- occasionally- guitarist and bassist of crossover thrash band M.O.D., and he was also the singer of its predecessor, Stormtroopers of Death.
He was also the singer of United Forces, which also featured his Stormtroopers of Death bandmate Dan Lilker.
Sophia Magdalena of Denmark
Sophia Magdalena of Denmark (3 July 1746 – 21 August 1813) was Queen of Sweden as the spouse of King Gustav III.

Question: Who is the spouse of the performer of song Azzurro?
Answer: Claudia Mori