Paul Anka, Geo. Hamilton IV, and Johnny Nash are three significant figures in the 20th-century music scene, each with distinctive styles and contributions. Paul Anka, a Canadian singer-songwriter, became famous for his pop hits in the 1950s and 60s like "Diana" and "Put Your Head on My Shoulder". Geo. Hamilton IV was a significant figure in the country and folk genre, particularly noted for his crossover hit "Abilene". Johnny Nash, an American reggae and pop music singer-songwriter, made his mark with the reggae-influenced hit "I Can See Clearly Now". Each artist's distinctive sound and style played a role in shaping their respective genres.