From 1965, and what remains one of the most perfect debut albums in rock history, please enjoy The Byrds and the hauntingly lovely "Here Without You."
And from the 1989 Byrds tribute album Time Between, here's the incomparable Richard Thompson, with his then touring band partners Clive Gregson and Christine Collister, and their more or less unplugged cover version.
The song, of course, is by the Byrds' rather tragic Gene Clark, and I think on balance it's the most beautiful thing he ever wrote. I say this knowing full well, of course, that his more celebrated "I'll Feel a Whole Lot Better" is also on the same album. In any case, Thompson and company's version suffers in comparison with the angelic choirboy harmonies on the Byrds original, but I think it does the song justice nonetheless.