Rankin 's warm singing style and his soft , nylon-stringed guitar sound might suggest an artist more attuned to the supper-club circuit than the jazz arena , but his work contains many touches that appeal to the jazz audience .
Rankin 's warm singing style and his soft , nylon-stringed guitar sound might suggest an artist more attuned to the supper-club circuit than the jazz arena , but his work contains many touches that appeal to the jazz audience , especially as he introduced more `` standards '' from the 30s and 40s into his performances .