Par NELSON MARK KAILANA. Want to play beautiful Hawaiian melodies on your 'ukulele? Now you can! Learn to Play Slack Key Style 'Ukulele is a comprehensive instruction into the art of playing great solo 'ukulele…slack key style. Slack Keyâ'Ho `aluâ'is a melodic, finger-picked guitar style created by Hawaiian paniolo in the mid-19th century, known as 'Hawaiian soul musicâ€�. It is only natural tha…