VIDEO: Sneak Peek - Lady Gaga, Tony Bennett Appear on CBS SUNDAY MORNING, 9/21

Six years of working non-stop left singer-songwriter Lady Gaga exhausted, she tells Anthony Mason in an interview for CBS SUNDAY MORNING WITH CHARLES OSGOOD to be broadcast Sept. 21 (9:00 AM, ET) on the CBS Television Network. However, singing with legendary performer Tony Bennett makes her happy, she says.

Check out a clip from the interview below!

Gaga, born Stefani Germanotta, took a break from performing after her last CD, Artpop, didn't fare as well as predicted. The reviews even led her to doubt herself.

"I felt like people were holding me to a pretty high standard," Gaga tells Mason. "Everybody's hooting and hollering because, you know, I didn't sell 20 million records this time, which I did with my first album. And you know, it's not easy to replicate that. And you just - I don't have a formula."

The stress of those expectations, combined with a heavy workload, led her to step away from music.

"I have to make sure everything was okay," Gaga tells Mason. "Because it wasn't. You know, it's one thing to put a train on the tracks. But it's another thing to keep the train on the tracks. You can't just let a train out on the tracks and just run it out... I crashed."

That crash, she tells Mason, happened midway through 2013, and was caused in part by challenges she faced with her management. "I just didn't even want to make music anymore," Gaga says.

She's back now with a collection of duets with legendary singer Tony Bennett called Cheek to Cheek.

"This album will prove to her that she'll always be around, because it proves that she's a great performer," Bennett says.

Bennett and Gaga talk with Mason about their unique friendship and career advice Bennett has shared with Gaga.

Gaga tells Bennett she just wants to be happy. "And I can't tell you how happy this music makes me," she says.

CBS SUNDAY MORNING is broadcast Sundays (9:00-10:30 AM, ET) on the CBS Television Network. Rand Morrison is the executive producer.

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