Hartford and the members of the Aereo-Plain Band recorded Aereo-Plain, a blend of traditional bluegrass musicianship, and the hippie spirit of the '70s. The album has been called the forerunner of the genre now known as "Newgrass". The recording was done in informal jam sessions that created some 80-plus reels of tape. The tracks featured here are song sketches, outtakes, demos, impromptu jams, and goofing-off. Music critic Zac Johnson wrote that "If the sessions that were used on Aereo-Plain became the Revolver of the progressive bluegrass movement, this disc is more like the White Album or maybe Let It Be."
Writing for Allmusic, critic Zac Johnson wrote "The song ideas are there, but they feel looser and more free, with each of the performers playing with ideas and song structures, fiddling with things when they don't work, and milking them when they click." Rick Bell of Country Standard Time wrote "Its historical value can't be denied, yet much of it sounds as fresh and innovative today as it must have 30 years ago. Aereoplane offered up several dandy instrumentals and traditional numbers during their short time together... arguably the best among a career of sometimes offbeat, but never dull music."