Text from the article at frontpage:
One of the really interesting parts of songs are that they’re often psychic spells as well. So, if you don’t have a mind then you can’t benefit from most of them. However, some songs, like Ballad of Courage, don’t care if you’re alive or not, they just want you to have a mind.
I must say, until now i assumed that all non-living creatures were psychic immune, but there are currently a few exceptions like Gray Wrath and Whirling Spirit.
This song looks like a really cool and useful card. I would have liked to see the subtype 'command' on this one as well. Cant Gurmash sing ?