There are multiple artists with this name: Apollo was formed in 1969. They released one album, Apollo (1970). Their music was occasionally heavy and the band sounds like Led Zeppelin or Procol Harum, with little bit King Crimson in it. Members have been in other Finnish progressive projects.
2) Apollo Indie Dance / Post Punk band from Ballarat, Australia. They Began mid 2009 when two kids decided to constructively channel their boredom in the form of melodic sound.