What is the meaning of the word casually in this paragraph

“dylan was a revolutionary,” bruce springsteen said in his 1988 speech inducting dylan into the rock and roll hall of fame. “the way that elvis freed your body, bob freed your mind.” early masterpieces such as “a hard rain’s a-gonna fall” and “visions of johanna” and “like a rolling stone” fueled a debate: are rock lyrics poetry? the answer must be yes, because on thursday, dylan was awarded the highest honor for a writer: the nobel prize in literature. the swedish academy, in making him the first american winner since novelist toni morrison in 1993, cited him for “having created new poetic expressions within the great american song tradition.” –“dylan's nobel prize settles debate: rock lyrics are poetry,” dan deluca what is the best summary of the author’s claim? rock lyrics can be like poetry. bob dylan was a revolutionary. musicians deserve nobel prizes. more americans deserve nobel prizes.