Ah there you are Masaki! Yes it's a 2006 GS300 with a Mark Levinson Sound System with DVD. The small print on the outside of the system says DVD Audio/Video.....so it occured to me that it might somehow play music on the DVDs.
I did go to the
www.marklevinsonlexus.com site and noted:
Media Compatibility
CD, CD-R, DTS 5.1 CD, DVD Video, and DVD Audio Discs
