Check out Zune Marketplace this week for an eclectic pairing of free tracks. The first is a dance track "Crimewave" by Crystal Castles.

And for fans of African music, check out "méRua," part of the Garifuna Women's Project. From the description on their Social page: "Garifuna music has elements of African, Caribbean, and Native American music, in particular the soca of Trinidad, the reggae of Jamaica, and the rhythms of Cuba."
Both tracks are free and available for download now.