I'm a huge fan of the Grateful Dead! Have you heard any of their music? They formed in 1965 in Palo Alto, California.
yes, with jerry garcia 
Exactly! I really like their unique style which included elements of rock, psychedelia, modal jazz, country and blues! 
i do not seek their music out but will listen to it when it comes on
I understand. They've done well for themselves though, selling more than 35 million albums worldwide!
sort of a underground popular band
Not really. They were inducted into the Rock and Roll Hall of Fame in 1994 and one of their performances was added to the National Recording Registry of the Library of Congress.
do they still perform even without Jerry?