Singer Marianne Faithfull had said she was enjoying a "period of reflection" before her death earlier this year.
A new four-track EP of her work, titled Burning Moonlight, will be released on limited edition vinyl on 12 April for Record Store Day (RSD) before being released on streaming platforms on 6 June.
When she completed the project, Faithfull said: "It's a good time to look back, it helps me to remember all the things I've done.
"I can't say I'm a particularly nostalgic person, but I am enjoying this period of reflection."
The record was due to be announced as part of the RSD list supporting independent shops in February, but it was put on hold after the As Tears Go By singer's death aged 78 on 30 January.
Her son Nicholas Dunbar said of the EP: "As we grieve the loss of Marianne, we are pleased to announce the release of these songs, which she worked on during the year before her death.
"Marianne lived to create and perform music - it was her driving force, and she never stopped.
"Right up until the end, she was looking forward to this release, which now completes and celebrates her remarkable artistic career."
The new release has been inspired by Faithfull's first two albums, her self-titled pop LP and the folk record Come My Way, both originally released in 1965.
The EP is made up of songs including Burning Moonlight, which is inspired by As Tears Go By - written by The Rolling Stones' Mick Jagger and Keith Richards.
It also features Love Is, written by her grandson, and Three Kinsmen Bold, a traditional song Faithfull learned from her father.
The EP is completed by a new interpretation of the folk song She Moved Thru' the Fair, which she first recorded in 1966.
The EP has been produced by Head, who Faithfull first worked with in 2004 on the album Before the Poison.
He said of the project: "I'm so happy we found a time when Marianne felt able to write and sing again.
"When she asked me to produce these songs, we were all aware that her health had made things difficult. But, in true Marianne fashion, she persevered, and I think we were able to go in a new direction again - something she always tried to push herself to do throughout her long career."
Faithfull began her singing career in 1964 after being discovered by Rolling Stones manager Andrew Loog Oldham, becoming a muse to the band and co-writing Sister Morphine from 1971's Sticky Fingers album.
From 1966 to 1970, Faithfull was in a highly publicised relationship with Mick Jagger following his split from the model and actress Chrissie Shrimpton.
Her best-known work includes the album Broken English (1979), singles such as Come and Stay with Me, This Little Bird, and Summer Nights, and the Metallica collaboration The Memory Remains.
In addition to her music career, Faithfull also acted in films including The Girl on a Motorcycle with the French actor Alain Delon as well as theatre productions.
The new EP's title track is available as a single to stream and download now.
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