Bard - When should i use songs?

[Tenkiei]

Actually there's been a fair bit of misinformation here in regards to Foe Requiem, it doesn't buff your dps unless there is a summoner or Blm in the group. It's true that Brd has ele dps in the forms of Wind Bite, and Burning Arrow, but try this sometime, go attack a mob, record your burning arrow ticks, also record your Wind Bite hits/ticks...now repeat with Foe Requiem numbers stay the same, currently FR only actually effects elemental spells such as fire, thunder, blizzard.

the best times to use songs:
FR - as much as possible providing you have a blm or smn, it costs you 2.5s to put it up and will be a significant dps gain for them in the long run.

TP - almost never really, outside AoE situations very few classes actually run themselves dry on TP, and invigorate covers a lot of regen gaps as well, monks and warrior tanks are the only ones who might but seeing as it doesn't regen a whole lot without battle voice odds are good your monk/warr should just learn to manage their tp a bit better, because by running Army's Paeon you are lowering your damage AND your caster's damage (think no foe requiem).

MB - When whms oom....haven't ever had to run this for a sch thusfar, but keep in mind Whms do have shroud of saints as well so it's rare for them to oom with proper mana management.

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Before titan HM the situations where you run Mage's Ballad or Army's Paeon are few to none, if you wish to run them between packs to boost regen this can help speed things along from time to time when chainpulling. In titan and coil it's all based on player skill, gear, etc so you'll have to get a feel for things on your own.

PS: Don't run mage's ballad just because people cry for it, look at their mana and at the situation, you lowering your damage so the whm can be lazy and spam cure III to heal 200 points of damage slows the group down, only run ballads that lower your dps when players are doing their job, not as a crutch to allow them to play poorly. (yes I know rezzing is kinda people playing poorly, but we'll call that an exception).