In return for sharing your email with the bands you're interested in, you get a choice of a huge range of free music. They seemed like lovely people and it feels good to be able to do something nice for Christmas, so Call And Response are lending Hyacca's "Hanazono" to their seasonal offer. There are more than a hundred albums on their page, so there's sure to be something to attract your interest. See the list HERE.
They also have a Facebook page and a they made a promotional video (below):