premise: "I Never Picked Cotton" is a song made famous by country music singer Roy Clark. Written by Bobby George and Charles Williams, the song was released in 1970 as the title track to the album released that same year. The song peaked at No. 5 on the "Billboard magazine" Hot Country Singles chart that summer.
hypothesis: Billboard magazine sales were affected by the Roy Clark's song
reason: Just because his song made the charts doesn't mean magazine sales were influenced.