Tommy Chong is a comedian, actor and musician who is well-known for his
portrayals of hippie-era stoners. He is most known for his involvement in
the marijuana-themed Cheech & Chong  comedy movies with co-star
Cheech Marin (below), as well playing the character Leo on Fox’s
That ‘70s Show.

Bob Dylan (born Robert Allen Zimmerman) is a  singer-songwriter, poet,
and painter. He has been a major figure in music for five decades. Much
of his most celebrated work dates from the 1960s. He is well known for his 
1965 six-minute single “Like a Rolling Stone”. His earlier songs include
“Blowin in the Wind and “The Times They Are a-Changin” became
anthems for the civil rights and anti-war movements.