The Grateful Dead are amazing!  Do you enjoy their music?
I love them, one of my favourite rock bands. They were actually formed in 1965 in Palo Alto, California.
1965!  That is forever ago!  Do they still perform?
No don't think so. I haven't heard of any shows. The band was ranked 57th by "Rolling Stone" magazine in its The Greatest Artists 
I would have thought they would be ranked higher.  They are so iconic.  Are all the band members still alive?
No I know that some of the members have sadly passed away. 
Oh.  It seems crazy that their music and legacy still live on and continue to get new fans.
I know what you mean and totally agree. Thats why they were  rightfully inducted into the Rock and Roll Hall of Fame in 1994