Live Pink Floyd 1966-10-14
- 'Pink Theme'
- 'Gimme a Break'
- 'Piggy Back'
- 'Stoned Alone'
- 'I Can Tell' (somehow identified as Bo Diddley cover)
- 'Flapdoodle Dealing'
Studio Pink Floyd 1967
- 'She Was a Millionaire' (announced in press as 'Millionaire', B-side of 'Old Woman With a Casket')
- 'Early Morning Henry' (taken away by Norman Smith) (identified as Billy Butler song, actual relation with Barrett unknown)
Home demos solo 1967
- Boon Tune (given to Joe Boyd; maybe resulting in 'Here I go') (submitted to The Purple Gang)
Rehearsal room? Pink Floyd 1968
- 'Have You Got It Yet' (multiple runthroughs, everchanging) (as remembered by Waters)
Home demos solo 1969
- Madcap demos (as remembered by Iggy, if I remember correctly)
Studio demos solo
- 'Living Alone' (taken away by Gilmour) (suggested by some as maybe a version of 'I Never Lied to You')
Gilmour home studio 1971/1972
- sitting on a stool, Gilmour standing behind (as recently remembered by Ginger)
Live 1970s
- Stars (groupname, multiple public live performances)
Hotel 1970s
- unknown tapes collection (reportedly, Barrett gave away a box of tapes which soon got lost)

Barrett's Pink Floyd in studio with tapes on background, 1967
Notes:
- The All Saints Church Hall 1966-10-14 live concert so far has only survived as setlist. Maybe it just was never recorded, as so many of early Pink Floyd live.
- 'I Can Tell' is somehow identified as Diddly cover, apparently without actually having been heard. 'No Good Trying' repeatedly contains the phrase, coincidentally or not.
- 'Old Woman With a Casket' must be what became 'Scream Thy Last Scream', as it repeatedly contains that phrase.
- 'She Was a Millionaire' has been tried again in 1970 by Barrett solo (with Gilmour?), but didn't get further than a studio live instrumental backing track containing a huge mistake which throws the performance temporarily off its rail.
- 'Early Morning Henry' is mentioned on a Pink Floyd studio sheet (1967-10-23), preceded by "super of vibes and voices" work on Waters song 'Set the Controls for the Heart of the Sun'. This session is a mystery concerning any Barrett involvement.
- "Boon Tune", "Boon Tunes"? It's unclear to me if this lost tape contained one or multiple songs. I just remember such a tape being mentioned as lost.
- 'Living Alone' might still exist in Gilmour's private archive. As he's the source of the previously lost song 'Bob Dylan's Blues', on the same studio demo tape reportedly taken by him.
- Ginger about Barrett in Gilmour's home studio: http://atagong.com/iggy/archives/2020/0 ... tapes.html
- At least some of Stars performing live is remembered to have been recorded by Barrett. Maybe a copy of at least some of it was made, but that also got lost.
- Biography 'Syd Barrett & the Dawn of Pink Floyd' (Mike Watkinson & Pete Anderson) mentions Barrett giving away a box of tapes in the 1970s, when he lived in a hotel.
Barrett's mysterious 1970s tape box almost immediately got lost by the recipient. An hotel employee, who forgot it somewhere on his way home...
I call this box "The Holy Barrett Grail", as one can only imagine what treasures it might have contained. Maybe a document of the legendary Stars? Maybe demos for the often overlooked, officially unreleased, unfinished 3rd solo album 1974 sessions? Maybe 'If You Go Don't Be Slow' with lyrics? Maybe just ordinary radio recordings of football matches or whatever? Or maybe Barrett himself erased all tapes, giving them away to anyone to be reused? One can only imagine.
Tapes are said to have been expensive at that time. So, I guess it's not unlikely that someone just recorded anything over whatever these tapes might have contained...
Feel very welcome to give any corrections and additions. This is just what I so far remember having read, without minutiously checking sources.
(And it might also be interesting to make a list of unreleased recordings which are known to have survived, but which so far nonetheless remain unreleased.)