 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 Signing Choir performed " Imagine " along with other Lennon songs at the unveiling of the John Lennon Peace Monument in <unk> Park , Liverpool , England . Beatles producer George Martin praised Lennon 's solo work , <unk> out the composition : " My favourite song of all was ' Imagine ' " . Music critic Paul Du <unk> described " Imagine " as Lennon 's " most revered " post @-@ Beatles song . Urish and Bielen called it " the most <unk> pop song recorded to achieve classic status " . Fricke commented : " ' Imagine ' is a subtly contentious song , Lennon 's greatest combined achievement as a <unk> and <unk> . " 
