Highly Illogical is an album which contains a collection of songs performed by Star Trek actor Leonard Nimoy. Most of the songs were originally recorded in the 1960s. The collection includes "The Ballad of Bilbo Baggins", which tells the story of J.R.R. Tolkien's book The Hobbit, and has been included on various novelty compilations. The title song, "Highly Illogical", features Spock pointing out the foibles of human thought, such as relationships, automobiles, and greed.

Track listing