Masters of a polished, melodic, harmonic, often trippy/psychedelic sound.
Developed into highly-artistic concepts in their later years
Many other rock bands are great in their own ways (I particularly like Led Zeppelin's sound as well), and other genres have their own accomplishments, but there will be another one like the Fab Four.
Waffle: *Eats Pie* FOR THE BEATLES!!! LIVE ON!!!!!!
When I listen to them, I feel my mind clear. They're respected by many for a reason though. The harmonies are brilliant, sometimes similar to the Beach Boys (who are also awesome).
Some people think they're over-rated, and that people only like them because they're told it's good. I liked the Beatles songs before I knew the name of the band.
I love them.