Hollo posted 6 downloadable mp3s at Audiogig.com. Just click on the Audiogig.com link on the side bar to get your free music download. The download is time sensitive so get it while it's there.
An excerpt from their artist profile:
Höllõ has developed the unique sound that you hear today. Looking to make their break in the major East & West Coast markets, this group believes in hard work and professionalism. When asked what they thought makes this band different from others they responded. We play honest music for the fans there is not any of the “is that the same song stuff here”.