John Travolta

Inspired ... John Travolta.

JOHN TRAVOLTA has revealed he teamed up with Olivia Newton-John to record a festive album in a bid to ease some of the devastation he feels at Christmas about the loss of his son Jett.

Travolta and Newton-John have recorded together for the first time in 30 years for their album This Christmas, which includes a new track by John Farrar, the writer behind their Grease smash hit You're the One That I Want. But aside from celebrating their roles in Grease, their decision to work together was motivated by Travolta's desire to honour his son, who died in 2009, aged 16.

Travolta said Christmas was never an easy time of year for his family. ''Doing something for him makes it easier, because you're doing something, you're proactive, you're raising money for the foundation that represents him,'' Travolta said.

Olivia Newton John

Heartfelt ... Olivia Newton John.

He said guest artists including Barbra Streisand, Tony Bennett and James Taylor were happy to be involved, knowing proceeds of the album are going to the Jett Travolta Foundation and the Olivia Newton-John Cancer and Wellness Centre in Melbourne.

''It felt effortless,'' Travolta said. ''And everybody hopped on board effortlessly, we called Barbra and Tony and James and they all knew my son, so they just wanted to do this from their heart.''

Travolta was inspired by Paul Newman to raise money under Jett's name. ''Paul Newman did it through food, the Scott Newman foundation was to raise money for his son's foundation. People find different ways. I'm most comfortable doing it this way because I love to sing and I don't get a chance to do it a lot,'' he said.

''To join Olivia again, where we've succeeded at this level, to do that is a beautiful opportunity. I can't believe it.''

Both musicians, who spoke to Fairfax Media in a joint interview, are clearly thrilled to be working together again for the right reasons - and to acknowledge the influence Grease has had on popular culture. ''It came together in this really pure way, it has pure intentions. We still have little kids coming up to us who are discovering the movies; it's like three generations who love the movie, who are going to be thrilled to see Danny and Sandy, as they think of us, together again,'' Newton-John said.

''For us, it's a wonderful way of giving back to causes that we care about and we're also giving the fans back something.''

This Christmas is out now through Universal Music.