Sir Elton John's son is having piano lessons.

Sir Elton John

Sir Elton John

The 'Rocket Man' hitmaker insists his influence wasn't behind four-year-old Zachary's first foray into music and he isn't interfering or offering any advice.

Elton - who also has son Elijah, two, with husband David Furnish - said: "Zachary's having piano lessons, but he asked to have them -- I didn't say anything."

And Elton and David, 53, won't be putting any pressure on the little boy to follow in his dad's famous footsteps.

Referring to the late acclaimed classical pianist, Elton quipped: "He just knows what middle C is right now ... he's no Arthur Rubinstein, believe me."

David added: "Do you know how much pressure that would be?!"

The 68-year-old singer's boys saw him in action for the first time last weekend and David admits they were blown away by Elton's talent.

David told People magazine: "They saw the first three numbers of his show in Vegas.

"They were overwhelmed in the sweetest way. 'Wow! I didn't know Daddy could do that!' "

The couple recently splashed out $22 million on a 10-bedroom mansion in Beverly Hills.

The pair - who married last December, on the ninth anniversary of their civil partnership - also own another home in Beverly Hills, as well as a house in Atlanta, a villa on top of Mont Boron in Nice, a country estate in Windsor and a lavish townhouse in the affluent area of Holland Park in London.