Warning: Some songs contain mature content
We don't often dive into the world of /mlp/, and if you have no idea what that is, I'd recommend not searching for it unless you are adventurous about the various styles of pony in the fandom, but this is for a good cause!
Pretty much every genre has a presnse here, from silly parody tracks to full on epic metal and orchestral. An army of musicians collaborated here.
All proceeds will go toward the Autism Society of America, but if you are cheap, you can grab it completely free. Pay whatever you think it's worth.
Head on over here for it! And as with the warning up top, some songs do dive into touchy subjects, so listener discretion is advised.