Acronym Soup: PKOL?

Questions

it's common knowledge that crystal gayle and loretta lynn are sisters. who is the other singing sister?

james taylor slowed things down when he re-did which hit first released by jimmy jones in january of 1960?

jimmy clanton sang about which goddess with an earthly flair in 1962?

what was jimmy rodger's first hit in 1957 which included the lyrics 'god made the bees and the bees made the honey...'?

joe jackson looked mighty good on which 1979 album?