M1.XML 20130611 is released. M1.XML file for use with M1 - keeping up with changes in MAME. M1 plays the music from arcade games by running the code in the original ROMs (not supplied). This allows entirely authentic playback of classic video game tunes while you work.

M1.XML 20130611 Changelog:
6/11/2013 - 1919 Sets
A number of sets had changed roms including:
arkretrn, sidebs, superchs, wwfsstars

Data sync to MAME 0.149

Download: M1.XML 20130611
Source: Here