Lady Gaga angers Beatles fans by playing John Lennon's piano

Lady Gaga's devoted 'little monsters' would follow her anywhere. 

But they have someway to go until they can match The Beatles fans for dedication.

Forty years after the band went their separate ways, devotees have been attacking John Lennon's son Sean for allowing the modern pop star to play on their heroes piano.

Controversial: Lady Gaga playing on Sean Lennon's piano, a gift from his father John to his mother Yoko Ono

Controversial: Lady Gaga playing on Sean Lennon's piano, a gift from his father John to his mother Yoko Ono

Sean had tweeted a photo of the fishnet-clad Gaga seated at the white grand piano. 

But in response to a barrage of criticism he removed the snap of his friend.

Beatles fans raged that Gaga wasn't worthy to play the relic.

Sean pointed out: 'Pianos meant are to be played. Why is everyone so uptight? 

'What should we do, lock it away in a dusty room? So judgemental...'

John Lennon

Pedigree: John Lennon plays the Steinway piano in 1972 which he bought as a present for Yoko

When the criticism continued, he added: 'come on, lighten up...life's too short, there're enough real problems in the world.... 

'Firstly, he gave that piano to my mother for her birthday, it is hers, secondly, he was not uptight the way you seem to be.'

Poker Face singer Gaga may produce modern pop songs but is also an accomplished pianist.

She was a child prodigy on the instrument, playing from age four and writing her first piano ballad at the age of 13.

Little Monster: Lady Gaga performs at Madison Square Garden in New York this week

Little Monster: Lady Gaga performs at Madison Square Garden in New York this week

While Beatles fans were concerned that Gaga was playing Lennon's piano, her fans were sleeping in the overheated New York streets for a chance to see her play on the Today show.

Gaga tweeted encouragement: 'Thousands of precious lil monsters are sleeping in street outside TodayShow. 

'May NY watchover u, + may u sleep smiling under the stars. Amen.'