Their solo careers followed successful runs in celebrated classic rock bands. Their paths crossed most famously at Live Aid, too. Phil Collins also worked as a touring drummer for Robert Plant in the '80s. But which one should join the Ultimate Classic Rock Hall of Fame? You get to decide this 100-percent fan-voted honor.

Collins and Plant both began creating hits on their own after rising to fame in the '70s with Genesis and Led Zeppelin, respectively. Highlights for Collins included 1981's 'In the Air Tonight,' a 1982 cover of 'You Can't Hurry Love,' 1983's 'I Don't Care Anymore,' 1984's 'Against All Odds,' 1985's 'Sussudio' and 1989's 'Another Day in Paradise,' to name but a few. Plant, meanwhile, scored hits along a similar timeline with 'Big Log' in 1983, 'In the Mood' in 1984, 'Little by Little' in 1985, 'Heaven Knows' in 1988 and 'Hurting Kind' in 1993, among others.

Sounds pretty evenly matched. But then you might have thought the same thing about Def Leppard and Van Halen. Only Joe Elliott and company won in a landslide to become our newest inductees.

Once again, you decide who moves on to the Ultimate Classic Rock Hall of Fame semi-finals. Voting is allowed once a day between now and Monday, Oct. 20th, at 11:59PM ET. The winner will be revealed on Nov. 4. Be sure to read our official rules.