Troops operate more effectively with clear coordination. Often this is provided by a regimental drummer or piper, though units can be directed by other sources too – whether by a necromancer’s spells or the instinct to follow a pack alpha.
Musico is a unit-wide upgrade, normally represented by the presence of a regimental musician.
When performing a Reform Move or a Combat Reform, a unit containing a Musician may change the number of its files by~$$5 rather than the normal~$$1.
In addition, units containing Musician benefit from a +1 Discipline modifier when taking Command Tests.