Many avid Pink Floyd fans like to divide the legendary journey of the band in two distinct timeframes1 -- Waters Era (led by Roger Waters) and Gilmour Era (led by David Gilmour).
If you ask me to pick one, I'll always blindly root for the Waters Era because it has something eternal, something rare.
The Waters Era was enchanting for many many reasons -- lyrical strength, musical versatility, experimentation of instructions to name a very few. At that time, almost every aspect of the band was managed by Roger Waters -- the philosopher, the genius. For obvious reasons, he had taken responsibility of the primary songwriter, composer at that time, just after Syd Barrett left the band for mental illness.
From a lyrical point of view, Roger Waters basically written songs about life, abstraction, perspective, purpose -- all the lower level stuffs that run us but we hardly think about those deep enough. And obviously the theme of concept albums makes these ideas more powerful.
Now, how many songs have you heard about love that were written, sung in the Waters era? Did the Gloomy man of Rock produce some such numbers?
This is a tough question! haha.... Unlike the Gilmour Era, love songs in the typical sense was never get focused among all other abstractions he talked about. He talked about love alright, but in a more broader sense.
The very few pure love songs that were sung by Pink Floyd in his reign were basically in the earlier albums -- mostly before The dark side of the moon (1973). And Green is the color from album More (1969) is one of the rare pieces that were written, composed by Waters.
The song is sung by David Gilmour, keeping a lower pitch; his voice is hardly recognizable if you don't actually see him singing. Haha. Also, Nick Mason looked a bit off in this, but Rick Wright (RIP) seemed to had enjoyed the show.
Why am i talking about this specific song now? ...Well, for obvious reasons :)
1: Three including the brief Syd Barrett era.