High Quality Content by WIKIPEDIA articles! "A Puro Dolor" is a song recorded by Puerto Rican band Son by Four. It was written by Omar Alfanno and released as the first single of the second studio album of the band in 2000. The song reached number-one on Billboard Top Latin Songs chart, and became the longest running chart topper of the chart in history, spending 20 weeks at the top; this record was broken five years later by Colombian singer-songwriter Shakira with "La Tortura" which spent 25 weeks at number-one.