{$Robert Plant}'s follow-up to {^Pictures at Eleven} implements much of his debut's style and vocal meandering into a new and more exciting bunch of songs. The mysteriousness of {&"Big Log,"} the album's first single, reached the Top 20 in the United States and in the U.K., while {&"In the Mood"} is {^The Principle of Moments}' finest offering, proving that {$Plant} could roam freely with his voice and still have it work effectively. But {$Plant} doesn't stop here, as he gives tracks like {&"Wreckless Love,"} {&"Stranger Here...Than Over There,"} and {&"Other Arms"} an equal amount of curt abstractness and {\rock} appeal. Because {$Plant}'s voice is so compelling in any state, the convolution of his writing tends to take a back seat to his singing in most of his solo work, which is definitely the case in most of the songs here. {$Plant} went on tour with {$the Honeydrippers} within the same year of {^The Principle of Moments}' release, adding another facet to his already diverse solo repertoire. ~ Mike DeGagne, All Music Guide