'How can you not sing along?' Fans rave about Grease: Live! and heap praise on the stars... despite audio glitches during the Fox musical event

It was two thumbs up for Fox's ambitious Grease: Live! production on Sunday with viewers taking to social media to praise the performances, relive their memories and generally share their enjoyment of a good old-fashioned singalong.

Fans gushed about how much Julianne Hough, who played Sandy, looked just like Olivia Newton-John who starred in the film version with John Travolta.

And others praised the professionalism and talent of Vanessa Hudgens as Rizzo who insisted the show go on even though her father passed away hours earlier from cancer.

Singalong: Fans took to Twitter during the live telecast to express their delight at the Fox musical production that revived the hit 1978 movie on the small screen

Nostalgia: The musical with its familiar songs brought back memories for many

Praise: The audience was wowed by the performances of Vanessa Hudgens as Rizzo and Julianne Hough as Sandy. Vanessa went on with the show just hours after her father passed away from cancer

True star: There was nothing but admiration for the way Vanessa performed with everyone agreeing that she was phenomenal in the role

Inspirational: The former high School Musical star won over a whole new set of fans with her bravery and gutsy performance

There was praise for Aaron Tveit as Danny, too, and plenty of interest in his ability to master the pelvic thrusts required for the role of Rydell High's bad boy.

There was a lot of talk as well about how his hair stood perfectly up on end throughout the whole three hour performance.

Just about everyone agreed the technical crew did an amazing job, leaving viewers wondering how they managed to change the color of the car during Greased Lightning, and how they pulled of the car racing scene at the end.

Met expectations: The Fox production delivered for those wanting to see a recreation of the film, with Julianne as Sandy completely channeling Olivia Newton-John much to fans delight

Emotional: Twitter went crazy over Julianne's rendition of Hopelessly Devoted To You

Lookalike: Fans adored Julianne in the role

Iconic role: Aaron Tveit as Danny was also a big hit with the audience

Nailed it: The actor wowed with his leather and pelvic thrusts as he rocked the role of Rydell High's bad boy

Hair-raising: Some were completely obsessed with his hair and the fact it remained upright and barely moving throughout the three-hour show

Fast-paced: The quick costume changes also had the Twittersphere talking

The production moved between sound stages on the Warner Bros. studio lot in LA and left some viewers in awe of how they pulled it all off

There was also awe at the way the cast managed their super fast costume changes, and the special guest appearances by Joe Jonas and Boys II Men were generally greeted enthusiastically.

Twitter went crazy, too, when Didi Conn, the original Frenchy in the 1978 movie, made a cameo appearance to offer advice in the diner scene to Carly Rae Jepsen, who was playing the role Sunday night.

And the fabulous choreography and huge ensemble dance sequences left everyone gasping. 

Two thumbs up: Grease fans just couldn't get enough of the whole thing

Rehearsed a lot: The choreography was amazing with huge ensemble dance scenes coming off perfectly on the night

Seeing double: Fans of the 1978 movie went crazy when Didi Conn, who played Frenchy in the film, made a cameo appearance on Fox's live broadcast to offer advice to Carly Rae Jepsen

So cool: Grease aficionados appreciated some of the little touches producers brought to the live event

Celebrities tuned in for the live broadcast with Bravo's Andy Cohen tweeting; '#GreaseLive is making me smile.'

'Grease is the word,' tweeted out Joel Madden. 

Chrissy Teigen informed her Twitter followers that she had been settling down to watch the show and her power went out.

She nevertheless went ahead with her plan to live tweet it, while acknowledging she's 'never even seen the movie grease (sic) in its entirety.''I will now live tweet grease (sic) live despite not watching and not ever seeing it,' she wrote.

He watched what happens live: Bravo's Andy Cohen tuned in for the broadcast that was live on the the East Coast on Fox

Disappointed: Model Chrissy Teigen had planned to watch but the power went out

Not deterred: But the pregnant TV personality decided to live tweet the show anyway

Summed it up: Joel Madden had just four words to say about Sunday night's Grease Live! event

The live show wasn't without a few glitches though.

There were plenty of people who took to social media to complain about the quality of the audio that seemed crackly and that, at one point, dropped out altogether for about 30 seconds during the performance of Hand Jive.

The show's Twitter team immediately tweeted: 'We're live.... sometimes you lose sound!'

How did they do that? Viewers were left puzzled about how producers had transformed the white car....

...into a red car during the live performance of Greased Lightning 

Glitches: The telecast did have some technical issues, however, with many complaining about the quality of the audio

Unhappy: The static and crackly sounds impacted quite a lot of the show

That's showbiz! Theproduction team at Grease: Live! tweeted an apology after audio went down completely during the performance of Hand Jive

They later tweeted they were trying to fix the issue so that it would sound better in the West Coast re-broadcast, that wasn't of course actually live. 

Some complained that the broadcast jumped around, going back to previous scenes and cutting off to commercials halfway through a musical number.

And some moaned they couldn't hear some of the songs and dialogue because of the reaction of the live studio audience.

Raised the bar: Generally folks felt that the event was a big success and had set the standard for future live musicals on television

Perfectly coordinated: The choreography for the ensemble dance scenes was impressive

Impressive: Aaron and Julianne put on an energetic display as they brought the roles of Danny and Sandy to life in the high school gymnasium

The critics, too, generally approved of what Fox managed to pull off and agreed that they'd raised the bar for live musicals on TV.

NBC started the trend with live telecasts of The Sound Of Music, Peter Pan and The Wiz! but Grease: Live! took the concept to a whole new level.

The Hollywood Reporter said in its review: 'NBC has made a winter tradition of live theater that, at its best, feels like it's live theater, but Grease: Live showed if you have that desired vision, live television needn't have any barriers.'

The production 'upped the standard for all live TV musicals from here on out,' said TV Guide.

'The show successfully managed to combine all the nostalgic elements of Grease that everyone expected while creating a new experience,' the review stated. 'This wasn't a show - it was a spectacle and the applause was very much deserved.'

Set a new standard: Grease: Live! utilized multiple sound stages and outdoor locations on the Warner Bros. studio lot in LA

Huge number of actors and extras: The Fox musical also had the biggest cast yet for a live show

Raising the bar: The show was far more highly praised than The Sound Of Music Live or Peter Pan Live