After a hotly contested month of voting, the Doobie Brothers and ZZ Top have reached the finals of the Ultimate Classic Rock Hall of Fame's December election.

Every month, our readers will decide which of eight legendary artists or bands will be honored for their contributions to the genre. The Doobie Brothers began life as a guitar-based rock band, but had their biggest chart success when singer Michael McDonald led them toward more commercial, R&B-influenced pop music in the second half of the '70s.

Similarly, ZZ Top steadily earned a spot as one of the biggest rock bands in the land during the '70s with their blend of rock and blues, but became a household name around the world when they added synthesizers, sequencers and a New Wave attitude to 1983's 'Eliminator.'

So who gets your vote? Because of the holidays, we're extending the finals by a full week. You can vote once a day between now and Sunday, Jan. 5, 2014, at 11:59 PM EST. The winner will be announced on Jan. 6. Be sure to read our official rules. Happy holidays, and happy voting!