Always Been Believed (ROTG fanfic)

Melody, a lonely new guardian. She's the new one but she believes she's only there because of her evil sister. Sure Mels loved her music, but her sister is set out to destroy everything. So, when the sister-in-question joins a pitch black side, the kids tend to move toward despair. The only problem is that no-one can stop believing in music, it's always there. But that isn't the only problem she comes over. There's another guardian called Jack, and everyone knows Jack, but only some know Mels. So what happens when Melody starts to feel something toward this frosty boy? Well, it might just make the music in the world stop and turned into sad songs. That is IF her sister has success in her plans... And it's actually not a big if...