"From Texas": The Moody Blues, Tuesday Afternoon

I was watching TV and suddenly, during the commercial for Visa's Check Card, a particular sound caught my attention. It was the beginning of an absolutely amazing song I’d never heard before.
I couldn’t recognize the band and I didn’t understand the words (so I couldn’t look for it on the web), so I had to ask to an American friend of mine for a suggestion.

The song is “Tuesday Afternoon”, composed by the British band The Moody Blues in 1968 (on the album this song was listed as “The Afternoon: Forever Afternoon (Tuesday?)", at the insistence of the producer).
The Moody Blues were born as a blues band, but after the introduction of orchestral arrangements and the tones of mellotron, they set the stage for the progressive rock movement.
In fact the strange sound I was listening to was produced by the “mellotron”, an electronic keyboard invented some years earlier.

This band composed the only song by them I knew: “Nights in White Satin”, of which the Italian band I Nomadi performed a cover called “Ho difeso il mio amore”.

According to an interview with Justin Hayward, he wrote "Tuesday Afternoon" while sitting in the middle of a field near his home in England on a beautiful spring afternoon. He claims that he had his acoustic guitar in hand and the song just came to him.

The use of mellotron fits the poetry of the lyrics and the daydreaming atmosphere and it’s like getting captured in this fantastic and relaxing world, a place where you can find your peace of mind.
Was the writer under the effects of any drugs or does this song reflect the habits of that period? In the 60’s and 70’s the use of hallucinogens and psychedelic drugs became a very popular means to find a new realty and to reach the truth.

“I'm just beginning to see, now I'm on my way
...
Something, calls to me,
The trees are drawing me near, I've got to find out why?
Those gentle voices I hear, explain it all with a sigh.”