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Mick Jagger hosts “Saturday Night Live” for the first time this weekend. Although Keith Richards has confirmed there will be no Stones performance in the 37th season finale, there will be plenty of other satisfaction for music lovers in the form of appearances by Foo Fighters, Arcade Fire and Jeff Beck. In the promos above, Jagger and Kristen Wiig explore the great mysteries of life: sex, drugs and magic. But the greatest mystery of all — whether Wiig will return for another season — remains unclear.