Actually, Cream was a blues band.  They were the first "Super Band", the term coined when they first played together.  They have been called "The Holy Power Trio" and changed rock music in a profound way in a manner somewhat similar to what Hendrix did to the guitar.  Cream was two rock bands.  One was the studio band that catered to the mass public who in general are spoonfed mediocre music to make money for large production companies.  The other band was the "live" band.  That is were Cream separated the men from the boys.