Who did Elvis Presley open for in the early 1950’s? The answer—Slim Whitman, a Country/Folk singer from Florida whose 1955 single of “Rose Marie” held the record for longest time at number 1 on the British charts until Bryan Adams topped him in 1991. Slim Whitman’s album, “America’s Favorite Folk Artist,” released by Imperial Records in 1954, is worth up to $500.00 today.