Here's how I understand it:
1. Art comes into play for anything that involves a save.
2. The following bard skills involve saves:
- songs of dancing, to resist getting caught up in the dance
- songs of sleep, to resist full sleep as a non-combatant
- songs of silence, to resist full entrancement
- power chords, to resist their side effects
- scrolls
- persuade
(Songs of dancing is the only one I'm not sure about. There -might- be something else besides a will save to avoid the effect.)
3. Therefore, art is useful for the things listed above.
Anyway, it's not a priority stat since much of the bardic skill set isn't affected. Bards have enough problems distributing their points elsewhere, so I wouldn't bother with art trains unless you plan to make heavy use of offensive scrolls or persuade.
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