: This could be a username or an abbreviation. "J" might stand for a name or a word, and "Nn" could be a shortened form or a nickname.
If you encountered this string on a file-sharing network, it might be a user-generated title rather than an official product name. J Nn Thisiscoolinjapan Sumire Kawai ICBR 35006 ...
ICBR follows a common Japanese catalog numbering scheme: : This could be a username or an abbreviation