The rocker wrote The Veil exclusively for Oliver Stone's new Snowden biopic, and was thrilled when the man himself agreed to make an appearance in the promo.

"As we become so visible in the digital world and leave an endless trail of data behind us, exactly who has our data and what they do with it becomes increasingly important," Gabriel says in a statement. "Snowden's revelations shocked the world and made it very clear why we need to have some way to look over those who look over us.

"With increasing terrorist attacks, security is critical, but not without any accountability or oversight."

Snowden is currently exiled in Russia after leaking classified National Security Agency documents detailing the lengths officials go to to keep a watchful eye on American citizens.

"I was very happy to learn Oliver Stone had decided to make a film about Edward Snowden and believe this is a powerful and inspiring film," Gabriel adds. "Oliver takes his music very seriously and I have always enjoyed collaborating with him."

Snowden, starring Joseph Gordon-Levitt as the whistleblower, is released in cinemas from Friday (16Sep16).