I'll try and keep this brief, something that may prove wildly optimistic given the band in question.
Last week I received my regular 'What's On' e.mailing from the Roundhouse in London's Chalk Farm. Titled 'Happy Birthday to us!' it informed me that October 15th marked the 50 year anniversary of it opening as a performing arts centre. "In 1966 the Roundhouse opened with a wild party, featuring a little known band called Pink Floyd". 
By coincidence on tv this evening, BBC4 are showing a programme called 'Pink Floyd Beginnings 1967-1972', at 9pm*.
Selecting something by Pink Floyd prompts the question 'where do I start?', with so much to choose from. Eventually I took my cue from tonight's programme and made life easier by restricting myself to the beginnings and this 5 year period. Even then it wasn't easy, but finding this little known track from the Soundtrack to the film 'More', released in 1969, is a nice reminder of a 'Relic' that perhaps has been lost in the years since. (It may even turn up in tonight's programme?)
The first minute of the song is all bird sounds, suitably weird but typical Floyd - then the YouTube video offers the chance to brush up on your italian as the lyrics are translated, before the images become a wildlife documentary again only for the ending, somewhat appropriately, to turn into a bit of a 2001:Stargate on the  STAR TRACK . 
'Cirrus Minor' begins very tranquil and peacefully…

'Cirrus Minor' was also on 'Relics' - a compilation album first released in 1971.

*If you switch on early this evening you'll catch a different kind of 'Good Old Days' in the shape of Music Hall entertainment and Danny La Rue. Be careful music lovers.