The lilypond book example version 2.1 contains several links to code for music examples such as
http://lsr.dsi.unimi.it/LSR/Item?id=634 http://lsr.dsi.unimi.it/LSR/Item?id=627 The server they refer to is not found. I'm using LyX Version 2.1.2 (23 September 2014) on a PC with Windows 7 and miktex 2.9
