From October 1966, please enjoy the seriously and inexplicably underrated Lovin Spoonful and the instrumental track to their gorgeous folk-pop ballad hit "Rain on the Roof." Featuring some of the loveliest fingerpicking ever heard by sentient mammalian ears and Zal Yanovsky's brilliant fuzz-guitar imitation of the sound of a French Horn.
At this point I would usually post the song's lyrics and encourage you to sing along, but I don't think I will today, given that the track is simply perfect without any vocals at all.
Seriously -- this is like a great little piece of chamber music, just as it is.