Hi, here are good news for all MB-Friends and Ipod Classic 120GB User (Gen6).
I use the Rockbox Firmware r31516 from EmCORE [freemyipod.org].
After a slightly bumpy preinstallation method over "UMSboot", the second stage of Installation (RockBox) was easy.
So I use MB with my Ipod Classic.
The directory structure was generated by the tags and a search of a certain title is so much easier as by Apple.
The only problem was to find the correct USB-Driver for the Ipod.
I download the Itunes-exe and extract the file with 7Zip.
So I use the original Apple file: AppleMobileDeviceSupport64.msi
So I send Mediamonkey to retire and use only MB