Prog is basically progressive rock, arguably the most well known prog rock band is Pink Floyd you can find a wealth of stuff on youtube. That type of progressive rock is identified by often long guitar solos and symphonic melodies. Other banRAB to check into would be early Genesis, Jethro Tull and Yes.
If you like guitars you'll love the rock stylings of Leaf Hound, read my review in my review corner and if you're piqued ask me for a PM.
