Read the following paragraph and extract the answer for the question: What is the first name of the person who was said to be a balladeer and agitator?

Jimmy Carter said, "in many countries around the world – my wife and I have visited about 125 countries– you hear John Lennon's song 'Imagine' used almost equally with national anthems." On 9 October 2010, which would have been Lennon's 70th birthday, the Liverpool Singing Choir performed "Imagine" along with other Lennon songs at the unveiling of the John Lennon Peace Monument in Chavasse Park, Liverpool, England. Beatles producer George Martin praised Lennon's solo work, singling out the composition: "My favourite song of all was 'Imagine'". Music critic Paul Du Noyer described "Imagine" as Lennon's "most revered" post-Beatles song. Authors Ben Urish and Ken Bielen called it "the most subversive pop song recorded to achieve classic status". Fricke commented: "'Imagine' is a subtly contentious song, Lennon's greatest combined achievement as a balladeer and agitator."Urish and Bielen criticised the song's instrumental music as overly sentimental and melodramatic, comparing it to the music of the pre-rock era and describing the vocal melody as understated. According to Blaney, Lennon's lyrics describe hypothetical possibilities that offer no practical solutions; lyrics that are at times nebulous and contradictory, asking the listener to abandon political systems while encouraging one similar to communism. Author Chris Ingham indicated the hypocrisy in Lennon, the millionaire rock star living in a mansion, encouraging listeners to imagine living their lives without possessions. Others argue that Lennon intended the song's lyrics to inspire listeners to imagine if the world could live without possessions, not as an explicit call to give them up. Blaney commented: "Lennon knew he had nothing concrete to offer, so instead he offers a dream, a concept to be built upon."Blaney considered the song to be "riddled with contradictions. Its hymn-like setting sits uncomfortably alongside its author's plea for us to envision a world without religion." Urish and Bielen described Lennon's "dream world" without a heaven or...
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