Bob Dylan's early career as a protest singer had been inspired by his hero Woody Guthrie, and his iconic lyrics and protest anthems helped propel the Folk Revival of the 60's, which was arguably the first major sub-movement of the Counterculture. Although Dylan was first popular for his protest music. the song Mr. Tambourine Man saw a stylistic shift in Dylan's work, from topical to abstract and imaginative, included some of the first uses of surrealistic imagery in popular music and has been viewed as a call to drugs such as LSD.