Masterpieces does not necessarily have to be born in the creative heavy and prolonged agony. Many popular songs have been written just for 5 minutes, but many generations loves them.
The Beatles - Yesterday
As Paul McCartney said that he did not compose this song specifically. Just one day wake up in the morning, he realized that it sounded in his head. Thus was born the imperishable hits. Starting with the imitation of classic American rock 'n' roll of the 1950s, The Beatles came to their own style and sound. The group had a significant impact on rock music and is recognized by experts as one of the most successful groups of the XX century in the creative and the commercial sense.