The Rolling Stones may be known as the World's Greatest Rock 'n' Roll Band, but apparently there's another band out there more worthy of the title. Cream beat the Stones in the semifinals of the 100 percent fan-voted Ultimate Classic Rock Hall of Fame, and now they're going up against the Moody Blues in this month's finals.

The supergroup -- made up of Eric Clapton, Jack Bruce and Ginger Baker -- ended up with nearly 61 percent of the vote. Not bad for a band that stuck together for only two years (the Stones, on the other hand, recently celebrated their 50th anniversary). Meanwhile, the Moody Blues scored a whopping 80 percent of the vote over the Beach Boys.

But we're guessing neither band will as easily stomp over the competition this time. Both groups are long loved by the classic rock community. Cream were one of rock's first supergroups, and to this day they remain one of the best -- a prime example of what can be achieved when three talented musicians get together for a sole purpose. The Moody Blues also came of age in the '60s, first as a British Invasion pop group and then as one of the pioneers of the innovative classical rock scene, which paired modern music with orchestras.

Both bands sealed their legacies long ago. Now it's up to you to decide who moves on to the final round and makes it into the Ultimate Classic Rock Hall of Fame. You can vote once an hour between now and Dec. 29 at 11:59PM ET. This month’s winner will be announced on Dec. 30. Be sure to read our official rules.

See the Yearbook Photos of Eric Clapton and Other Rock Stars