​Meghan Trainor: More than just the bass

"Do you think about how that song resonates with some little girl who was like you, sitting in a baggy sweatshirt?" asked Smith.

"Yeah, I get messages all the time: 'I hated myself. I didn't wanna go to school. I was so uncomfortable, and now I love myself. And I was in a really dark place until your song came out.' And I was like, 'Whoa, man, we gotta do more of these. We gotta do more of these songs!'"

These days, just about everything in Meghan Trainor's world has changed. [During her return to Nauset Regional High, one student asked if she'd be his prom date.]

"All About That Bass" is still her biggest single, but she's no one-hit wonder. Last month, she won a Grammy Award for Best New Artist.

Her dad was her date: "When they said, 'Meghan Trainor,' hugged him, I went to go up, he whispered in my ear, while crying, 'You made it!' And I lost everything. I broke apart and I was, like, 'Oh, no, I'm never gonna make it up these stairs.' Like, I need to go cry. I don't know if I can do this!"

Meghan Trainor accepts the Best New Artist Award from singer Sam Smith during the 58th Grammy Awards at Staples Center on February 15, 2016 in Los Angeles. Kevork Djansezian/Getty Images

Truth is, there's a lesson in Trainor's story: the best way to conquer self-doubt is to follow your dream, and to work your bass off.

Smith asked Gary Trainor, "How proud are you of this young woman?"

"Oh, I mean, I'm sure everybody knows as well as we remind ourselves all the time how wonderful it really is."

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