So, this came up and I really need an idea of how to rule this.
The level three skald performance states this:
Song of Marching (Su): At 3rd level, a skald can use raging song to inspire his allies to move faster without suffering from fatigue. By expending 1 round of raging song, the skald invigorates allies within 60 feet, who may hustle (Core Rulebook 170) for the next hour; this movement counts as a walk (not a hustle) for the purpose of accruing nonlethal damage and fatigue. The skald must continue to perform the song for the remainder of the hour, otherwise its effects end, but only 1 round of raging song is expended for that hour.
However, the mounted Overland movement rules state the following:
Mounted Movement: A mount bearing a rider can move at a hustle. The damage it takes when doing so, however, is lethal damage, not nonlethal damage. The creature can also be ridden in a forced march, but its Constitution checks automatically fail, and the damage it takes is lethal damage. Mounts also become fatigued when they take any damage from hustling or forced marches.
Would you rule that Song of Marching allows mounts to hustle without taking the lethal damage?