I should also check if there's any confusion with the numbering. "PDF 13" isn't standard, so the user might have heard it from somewhere. Maybe it's part of a larger set or a miscommunication. Clarifying that and offering alternative ways to find his music would be useful.
Christopher Laird Simmons has been a working journalist since his first magazine sale in 1984. He has since written for wide variety of print and online publications covering lifestyle, tech and entertainment. He is an award-winning author, designer, photographer, and musician. He is a member of ASCAP and PRSA. He is the founder and CEO of Neotrope®, based in Temecula, CA, USA.
I should also check if there's any confusion with the numbering. "PDF 13" isn't standard, so the user might have heard it from somewhere. Maybe it's part of a larger set or a miscommunication. Clarifying that and offering alternative ways to find his music would be useful.