Comments:

The Byrds´ roots in folk music does not deny themselves, however, and the group gives fine and up to date interpretations of folksongs like "Wild Mountain Thyme" and "John Riley".

The album is also characterized by McGuinn's, in particular, fascination with outer space, which is reflected in tracks such as "Mr. Spaceman”, ”2-4-2 Foxtrot” and the title track; all songs he as a songwriter contributed to. Mcguinn also has songwriting credit on other key songs such as "I See You" and "Eight Miles High" both with Crosby; the latter even with Gene Clark, who also appears on this track. Crosby contributes as a solo composer with the fine "What's Happening", which is one of his finest Byrd songs. Among less interesting tracks are a version of "Hey Joe", which is more reminiscent of the Love's than Jimi Hendrix's, the somewhat gloomy "I Come and Stand at Every Door" and the instrumental "Captain Soul"

Considering that the album has a rather short playing time, one can wonder/regret that fine tracks like "Why" and "I Know My Rider" didn't get a place on "Fifth Dimension" in the first; they absolutely deserved it. Fortunately, they were later added as bonus tracks among some alternate takes as well as a previously unreleased Crosby track, "Pchycodrama City", which actually also could have been included in the first place.

With gems like "Eight Miles High", "I See You", "Fifth Dimension", "Wild Mountain Thyme" and "John Riley", the album can only be considered a classic, and an album that proves that the Byrds were/are never boring company.