"Hello Mary Lou" was written by Gene Pitney but famously recorded by Ricky Nelson in 1961, becoming a rock and roll classic.
"Hello Mary Lou" is a classic pop song blending rock and ballad elements, characteristic of Pitney's dramatic vocal style and orchestral arrangements popular in the early 1960s.
"Hello Mary Lou" is a rock and roll classic famously covered by Ricky Nelson, though Gene Pitney wrote and recorded an earlier version. The chord modification mentioned likely reflects harmonic adjustments for vocal arrangements.
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