This thesis deals with the literary hit potential analysis of the most successful Beatles hits. In detail, the aim is to examine in how far the Beatles followed and defied the rules of commercial lyric writing. First, the main differences between pop lyrics and traditional lyric genres are examined. The succeeding chapters are dedicated to the investigation of commercial guidelines in the area of formal criteria, revealing the significance of the creation and positioning of the hook line, which is understood as the most memorable line in a song. In addition, the most essential aspects concerning rhyme, meter and the use of figurative language are summarised. The second part consists of the song analysis. Based on a table showing the twelve most successful number one hits of the Beatles in the USA, UK, Australia and Germany, the song lyrics are investigated according to the theoretical tools. The qualitative approach guarantees a precise analysis, whereby significant aspects, which elucidate either the fulfilment or rejections of the rules, are pointed out.The conclusion stresses the most essential aspects of the analysis. McCartney, whose work stands out through the creation of rousing hook lines, turns out to be the master of commercial patterns, while Lennon, who frequently ignores the adherence to rhyme, meter and form, defies the conventions and puts the emphasis on the message. All in all, the analysis demonstrates that the use of the repetition principle as well as the message's universality represents the guidelines of commercial songwriting. However, the golden mix emerges through the influence of unorthodox techniques, which do not come to the surface until a more careful analysis is undertaken. The experimental approach toward formats, the daring characterisations and the progressive selection of topics create the basis for the secret underlying the Beatles' treasure trove.