Justin Bieber's unaired SNL skit has finally been released. 

And there's a good reason it didn't make the final cut: it's the "greatest trainwreck ever."

At least, according to Bill Hader.

The "Song for Daddy" sketch features J.B., Hader, Fred Armisen and Bobby Moynihan as a country western band with a very strange song. The 19-year-old pop star plays Hader's son and keyboardist in the musical group.

Pretty much everything went horribly wrong during the dress rehearsal, but lucky for us all, Hader, along with writers Rob Klein and John Solomon, provide their personal commentary on the hot mess of a sketch.

Highlights include the stage almost falling on the Biebs and an audience that simply refuses to laugh or participate, as well as flubbed lines, problems with props and horrible lighting.

"In my time at SNL this has never happened before where one of the walls tipped over and almost fell…that's true fear on Justin Bieber's face. Yeah, he's scared," Hader recalls.  

"We did this at the table read, this sketch killed...We weren't worried at all about anything," the funnyman adds before commenting on the silent audience. "I'm just looking at young girls looking at me going ‘When is Justin going to do something? Is it really about this old man?'"

Sounds about right.

This isn't the first time Bill has subtly dissed J.B.

During a recent chat with Howard Stern, the funnyman dished on the singer's SNL appearance, giving him a less-than-glowing review. 

"Justin Bieber showed up with like 20 guys," Hader recalled, comparing the pop star to fellow SNL alum Justin Timberlake. "He had a guy holding a slice of pizza. A guy holding a Diet Coke. You're trying to fight through all these people to get dressed. Timberlake, it was just him. He's a real class act, that guy."

In other Bieber news, Asher Roth recently released a new track featuring the "Beauty and a Beat" singer and Chris Brown, which is appropriately titled "Actin' Up."

The Biebs also hit the stage in Los Angeles Monday night, where he serenaded a crying fan and flaunted his shirtless bod.

What do you think of the failed comedy sketch? Tell us in the comments!

PHOTOS: Justin Bieber's shirtless pics

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