I dunno, but this episode I found to be awfully similar to "Sadie's Song." Just like Sadie's song, it has a character wanting to perform music, but personal problems hold them back, but Steven steps in to help and then they put on a big Beach City show and resolve it.
Though I did like how it helped tell more about Sour Cream's stuff with Marty and Yellowtail. Nice to see them fleshed out more.
Yeah, I too can see the parallels, but the main difference is the Parents, Barbara and Fartass Mcgee *ahem* I mean Human Grinch *cough* I mean Farty Marty.
Barb really just wanted to see Sadie shine for everyone. She was proud of her daughter and she wanted to show the "world" that she could sing. And she was genuinely sorry for pressuring her daughter to perform.
MARTY on the other hand, just used SCs skill for his own gains. He hid his intentions from his son. He tried to use SC to promote Guacola and stuff.
So yeah, I see the similarities too, but this was definitely different from Sadies Song.