DJ Samantha Ronson has come to her brother Mark’s defence after the super producer was slammed by Oasis guitarist Noel Gallagher.

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Referring to a recent Jay-Z collaboration with Kanye West which makes reference to Oasis in the lyrics, Sam wrote on her MySpace blog: “Jocking Jay-Z – the closest Noel from Oasis has been in years to being on the radio.

“He should stop focusing his energy on dissing people and go back to ripping off Beatles songs. Far more productive. Jealousy is really unbecoming.”

Mark Ronson blasted Noel after the Oasis rocker said last week that he should “learn three chords on the guitar and go write a tune”, instead of ruining other people’s songs.

Now the Valerie hitmaker – whose album of covers Version was a massive hit – has taken a swipe at Noel joking he is being taught to play guitar by rapper Jay-Z.

The hip-hop star mocked the Lyla rocker onstage at Glastonbury following Noel’s comments a rap artist should not headline the music event.

Mark wrote on his MySpace page: “I just want Noel to know that I’m actually taking guitar lessons from Jay-Z right now and he’s already taught me both chords to Wonderwall (tune!).

“In fact, it’s so much fun having Jay teach me all of Noel’s songs on the guitar (hooray!) that I’m thinking of doing an Oasis/Jay Z remix album a la The Grey Album. Potential titles are Champagne Superhova or Definitely Jay Z.

“P.P.S. Noel, I did write a song called Back to Black, which actually has seven chords in it!”