It's a dangerous spell but can also be very effective. Another great bard song allows you to charm your opponent. By using this song you will be able to take that impossible to kill pull of three monsters and change it into just two while adding one to your party. This spell can be a lifesaver. Beware however that once charm breaks the monster will hate you like no other.
Chain is very useful to stop runners.
Fear is generally not a useful spell. Many bards however employ a somewhat cheesy tactic where they will fear the monster then chain him over and over. This tactic will allow them to constantly hit the monsters backside without being hit. It is sort of a reverse kiting tactic. While it remains an effective tactic be warned that you probably won't make many friends if you employ it as a large amount of other players consider this cheesy or even an exploit.