RCA's session log for this session only lists band musicians, with no mention of backing vocalists. It also fails to show "Kentucky Rain' as having band overdubs during this session, but the 8-track tape legend shows that piano and tambourine were overdubbed on the final master, which could have only been done at this session.

Backup vocal overdub details from this session comes from the logbook of Mary Holladay Pederson, who sang backing vocals at this session.

Chips Moman again brought in Mary Holladay and Sandra Posey, but also hired Donna Rhodes to sing backing vocals with them.

Some instruments, such as bass and left channel organ effect (perfectly isolated), of the basic track of 'Gentle on My Mind' were replaced on March 20.

Most or all of the harmony vocal is thought to have been provided by Ronnie Milsap on the March 20 overdub session, but there is a possibility that they were overdubbed by Joseph Babcock on March 25.

Usually the backup vocal overdubs would be recorded on a single track of the 8-track tape, separate to other overdubs, but with 'Kentucky Rain' the backup and harmony vocals, along with piano and tambourine overdubs, were all recorded together on one track, as no more tracks were left. Details of the 8-track tape for 'Kentucky Rain' are as follows:
I - Brass (overdubbed March 18 1969)
II - Lo Strings (overdubbed March 18 1969)
III - Voices / Harmony / Piano / Tambourine (overdubbed March 20 1969)
IV - Hi Strings (overdubbed March 18 1969)
V - Drum (recorded February 19-20 1969)
VI - Vocal (recorded February 19-20 1969)
VII - Piano / Rhythm Guitar / Organ (recorded February 19-20 1969)
VIII - Bass (recorded February 19-20 1969)

Sessions III lists 'My Little Friend' as having backup vocals overdubbed on January 23, but the session log shows that as of February 4 (date of the job number) no backup vocals had been overdubbed*. You can just about hear the backing singers during the guitar intro on the U.S. Male CD and the Almost In Love LP, as well as releases after 2007 (The Complete Masters etc.). They do not appear on any 1990s releases.

Sessions III lists 'Gentle On My Mind' as having backup vocals overdubbed on January 23, but the session log shows that as of February 4 (date of the job number) no backup vocals had been overdubbed*.

*According to Mary Holladay Pederson's logbook, 'Gentle On My Mind' and 'My Little Friend' had backup vocals overdubbed on March 20.

Thanks to Mary Holladay Pederson (The Holladay Sisters Facebook page)