I am a big Beatles fan.  They basically were responsible for pop music becoming an art form in the 1960s
The Beatles are a great band! If i recall the singer was John Lennon right?
They all sang. The band consisted of Lennon, McCartney, George Harrison, and RIngo Starr
I think all but two are dead now
Yes.  It is actually suprising Ringo is not dead.  He actually was twice diagnosed with serious illnesses in his youth.  
Do you know what illness ?
I am not sure.  I just know he was hospitalized several times in his childhood.
That is sad to hear, Do you know anything else about the band?