Final answer:
The Everly Brothers' harmonies and the dreamy atmosphere of the song contributed to its influence, shaping the landscape of romantic ballads in rock and roll.
Step-by-step explanation:
The Everly Brothers' song 'All I Have to do is Dream' (1958) was influential because of the harmonies and dreamy atmosphere of the song, which shaped the landscape of romantic ballads in rock and roll. The song did not introduce experimental electronic elements or pioneer the fusion of rock and classical genres. It was not a political anthem addressing societal issues. Instead, it became influential for its contribution to the development of romantic ballads in the rock and roll genre.