We call it magic, but it's actually based in Wave Theory. [And Wave Theory... is complicated.] I, um- only know a bit of how it works.

Basically, the Song is a command to the Tower... and the Tower uses energy to make the command real. In the case of Metafalica, it took a lot of energy. That's why we needed everyone on Metafalss to sing with us. All their hopes and wishes made it real.