Any track from A Gift From Euphoria, possibly one of the most eclectic albums of the time. Byrdsy bluegrass, baroque orchestrations, psych rock, Donovanesque folk and country etc. Did You Get The Letter certainly fits in the psychedelic rock section...
One of my relatives was a Drummer in a British 60s beat combo called "The Sombreros", who sadly split up before they could record an album. Their only officially released single is here - but I did the transfer a long time ago. If you like 60s reverb, you'll love this:
Here is an obscure one. It's Michael Blessing singing an anti-war song called "The New Recruit." You might know the artist by his other name....Michael Nesmith.
The arrangement (but not the song) is almost entirely borrowed from 'Reach Out (I'll Be There)', but most days I prefer this.
The go-to Flirtations cut is the totally awesome 'Nothing But a Heartache', but this is even more mind-blowingly sublime. I dare you not to get up and dance.
Here's A Bunch: Making Time (The Creation) Orange Rooftops Of Your Mind (Blue Things) One Hour Cleaners (Blue Things) Psycho (The Sonics) Strychnine (The Sonics) It's Cold Outside (The Choir) Never To Be Forgotten (Bobby Fuller Four) The Magic People (The Paupers) Oh How To Do Now (The Monks) Frustration (The Mystic Tide) The Third Eye (The Dovers) Jenny Artichoke (Kaliedoscope) -UK Egyptian Garden (Kaliedoscope)-US Moulty (The Barbarians) Don't Look Back (The Remains) Deflecting Gray (The Pretty Things) My White Bicycle (Tomorrow)
A few off the top of my head (and I'm sure these spill over into 1970 or so): He Wants to be a Star by Tin Tin Handbags and Gladrags by Mike D'Abo Blow You a Kiss in the Wind by Boyce and Hart The Good Mr. Square by the Pretty Things I'm a Gambler by Lace/Pete Dello Someday Man by Paul Williams
Looks like a lot of people here are familiar with these guys, not one the general public seems to know much about though.