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ROCK legend David Kaff, keyboardist from iconic mockumentary band Spinal Tap, has died at 79.

The keyboardist, full name David Kaffinetti, performed with the likes of Chuck Berry, and gained fame as a star in This is Spinal Tap.

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Rock star David Kaff has died at 79[/caption]

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David Kaff (back right) gained fame as the keyboardist in Spinal Tap[/caption]

A sequel to the movie is set to release in September, although Kaff is not set to reprise his role.

Kaff's band Mutual of Alameda's Wild Kingdom announced the news of his death on Friday, July 11.

They wrote: "Our brother David Kaffinetti passed away peacefully in his sleep yesterday.

"We are devastated by this event.

"David always had a kind word and a quick wit that would slay you where you stand. Then he'd make you smile doing it! RIP dear brother."

A cause of death wasn't noted.

He was known for portraying the keyboardist Viv Savage in popular 1984 musical comedy This Is Spinal Tap.

Directed by Rob Reiner, he co-starred alongside Michael McKean, Christopher Guest and Harry Shearer.

The mockumentary centred on the fictional heavy metal band Spinal Tap – characterised as "one of England's loudest bands".

With a score of 96 per cent on Rotten Tomatoes and a place among the National Film Registry, the film is a beloved cult classic.

It led to a performance on Saturday Night Live in 1984.

Kaff continued to perform with the band following its release but had left by the end of the year.

He wasn't involved with any further promotion but talked highly of his time on set in interviews.

In the film's end credits, Kaff's character reminds audiences to "have a good time…all the time."

The film's sequel will centre on Spinal Tap's final performance after a 15 year reunion.

Director Rob Reiner said: "So happy to be working with the folks at Bleecker Street who are passionate about keeping Tap's legacy alive and happy to give Marty DiBergi another shot at relevancy."

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A rare live performance by the fictional Spinal Tap. Kaff pictured on far right[/caption]

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Kaff (second from right) on the set of This is Spinal Tap[/caption]

Kaff was a founding member of the rock group Rare Bird from 1969 to 1975.

They were one of the first bands to sign with Charisma Records.

The band released five studio albums, with their song "Sympathy" selling an estimated one million copies globally.

He went on to work with Chuck Berry as a session musician for The London Chuck Berry Sessions in 1972.

Kaff was also a member of the band Model Citizenz.

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Director Rob Reiner and David Kaff (right) on the set of the 1984 mockumentary[/caption]