The Incredible String Band
'The Incredible String Band' (June 1966)
*Influential for its mix of traditional folk and odd instrumentation, as well as Heron and WIllaimson's vocal stylings.

The Butterfield Blues Band
'East/West' (1966)
*Critical in Barrett's development of the Pink Floyd's extended improvisations was 'East/West', a 13 minute jazz/blues meld based on Indian raga scales. In a December 1967 BBC session, Barrett clearly plays a Bloomfield lick on 'Pow. R Toc. H'

Rolling Stones 
'Aftermath' (1966)
*A Barrett favourite, this album's faux-Elizabethan 'Lady Jane' and 11-minute blues jam 'Goin' Home' paved the way for 'Piper at the Gates of Dawn's similar use of 'Interstellar Overdrive' and structured short songs. 

Yardbirds 
'Shapes of Things' (single March 1966)
*Jeff Beck's masterful solo, a blend of flamenco, blues, noise and raga, was arguably Britain's first overtly psychedelic song.

Bob Dylan
'Blonde on Blonde' (May 1966)

The Fugs
'The Fugs' (1966)
*Barrett bought a copy of this album at Miles' Indica bookstore in 1966, and later cited its influence in interviews.

Love
'Love' (1966)
*Peter Jenner humming Barrett the central riff of Love's cover of Burt Bacharach's 'Little Red Book' led to Barrett's proto-metal riff in 'Interstellar Overdrive'. Arthur Lee's blend of musical moods was also influential.

The Kinks
'Sunny Afternoon' (single June 1966)
*Influential on Barrett's more uptempo and playful songs, such as 'The Gnome' and 'Here I Go'.

Frank Zappa & The Mother of Invention
'Freak Out!' (July 1966)
*Barrett cited this album in an interview, stating that he had 'taken quite a lot' from this band as well as the Byrds and Fugs.

The Beatles
'Revolver' (1966)

Donovan
'Sunshine Superman' (single September 1966)

Cream
'I Feel Free' (single, December 1966)
*Notable for the duality of its hard rhythm and poetic lyric.

Luigi Nono (Per Bastiana Tai-Yang Cheng) 
Karlheinz Stockhausen (Hymnen)
*Barrett may have been exposed to these modern composers during 1966. The more intellectually oriented of the Underground were exposed to works such as these at the Indica Bookstore and in the pages of IT.

1967

AMM
AMMusic (1967)
*Recorded in June 1966, AMM's Keith Rowe was arguably Barrett's most important influence of all, opening the door for his experiments and using developing techniques which Barrett adapted.

The Rolling Stones
'Between the Buttons' (1967)
*Peter Jenner earmaked this album as a strong Barrett influence. Certainly, 'Paint It, Black' influenced Barrett's use of gloomy minor chords and menacing vocals. And may have set a precedent for the verses of 'See Emily Play.'

'Strawberry Fields Forever' 
(single 17 February 1967)
*'Strawberry Fields Forever' marked the way for Barrett in its revolutionary use of poetic images and superb psychedelic arrangement. It was released just ten days before the sessions for 'Arnold Layne', which bears its influence.

The Kinks
'Waterloo Sunset' (single May 1967)

The Incredible String Band 
'The 5000 Spirits Or The Layers Of The Onion' (July 1967)

Jimi Hendrix Experience
'Are You Experienced?' (1967)
*Barrett had already been performing 'Interstellar Overdrive' for several months prior to Hendrix's arrival in September 1966. It is probable that Barrett and Hendrix influenced each other equally. Hendrix caught the Pink Floyd live at UFO in December 1966 and toured extensively with them in late 1967.

Beatles
'Seargent Pepper's Lonely Heart's Club Band' (1967)

Crazy World of Arthur Brown
'Fire' (single)
*Arthur Brown's sense of showmanship, ominous vocals and his band's rhythmic intensity were likely Pink Floyd influences.

Soft Machine
'Soft Machine' (1967)
*Contemporaries (and competitors) of the Pink Floyd, the Soft Machine's jazz/rock improvisations were as influential to Barrett as his work was to them, particularly to Daevid Allen and Kevin Ayers, who both adapted Barrett's glissando technique.

1968-71

Taj Mahal
Ma Rainey
Family
Slade
*In interviews during 1970-1, Barrett stated he had been listening to albums by these artists, though their influence on his post-Floyd output seems neglible, save for perhaps Taj Mahal and Ma Rainey, whose folk blues stylings could have prompted Barrett to delve into the blues with songs like 'Long Gone' and the throwaway 'Maisie'.