Rarely has calculated stupidity made as much sense as in this vulgar, cartoonish rock opera, starring Jack Black and Kyle Gass as a pair of metal-worshipping musical losers in quest of stardom, redemption, and the rent money.

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For years Baldwin has been talking about ending his run on 30 Rock as the awesome executive Jack Donaghy.

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Jack Fate (Dylan) is a washed-up rock star who gets roped into a benefit concert by the unscrupulous promoter Uncle Sweetheart (John Goodman).

NEWYORKER: Masked and Anonymous

Jack White is the colorfully clad frontman of the fiery hard-rock duo The White Stripes.

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Jack Bradley Cave has only 15 milligrams of carbon per liter of water in the rock, the equivalent of 15 grains of sugar dissolved in a liter of water.

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For a man who can pump out such blistering, no-nonsense post-punk hard rock, the air of the more mannered art-school rocker hangs thickly around Jack White.

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Well, everyone loved the apple jack analogy but a number of you got in touch to ask for the exact classification of the rock.

BBC: Cosmic coincidence on the road to Glenelg