Sitting in between "Mr Tambourine Man" & "Turn! Turn! Turn!" (albums through which the Byrds asserted and consolidated their position as international pop stars) and "Younger Than Yesterday" (an album which firmly established them as a "new-wave"/"progressive" West Coast band), "Fifth Dimension" captures them in major transition mode.
With its curious mix of smooth folk-pop ("Wild Mountain Thyme" & "John Riley"), straight R&B ("Hey Joe" & "Captain Soul"), new and now dated recording techniques ("2-4-2 Foxtrot"), political commentary ("I Come And Stand At Every Door"), drug references ("What's Happening! " and "5D") and brilliant innovation ("Eight Miles High" and "I See You"), this record perfectly captures the diverse influences swirling around the music scene in early 1966. And... while the end result now appears unfocused it clearly reflects the problem facing creative pop groups of the time: how to assimilate these new, untested and rapidly developing influences into any form of cohesive, commercially viable whole.
The Beatles did it much better with "Revolver" but the Byrds came an admirable second with "Fifth Dimension": more flawed, less polished and much less satisfying but, at the time, equally important in that it showed that a group previously filed under "mainstream pop" was no longer bound by its past or the expectations of its record buying public. Alongside Revolver's "Tomorrow Never Knows", "Love To You" and "I Want To Tell You", Fifth Dimension's "Eight Miles High" and the wonderful "I See You" sent a clear message that the music world was in the process of radical change. The impact of these tracks on fans expecting more of the same - i.e. tuneful, properly structured three minute pop songs - was serious confusion but, the impact on their musical peers was enormous. If the Beatles and the Byrds - two of the most popular groups in the world at the time - could get away with putting such radically new music on mass market albums, then so could they. Within a year the musical landscape had changed forever but, what followed in the UK and the USA owed a great deal to the bravery of both groups in pushing their music into new and potentially far less popular areas.
As such, "Fifth Dimension" stands out as a pivotal record... not as good as their subsequent West Coast masterpieces - "Younger Than Yesterday" & "The Notorious Byrd Brothers" - but braver and in many ways much more important.