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I shall guide you to the light!
Bard guide. What skills are good, and which aren't.
Mabinogi's recent updated added the Battle Maestro / Battle Bard ability. A number of buff skills were added (Vivace,Lullaby,Dischord,Harvest Song, Enduring Melody, Battlefield Overture, March), and musical instruments don't have the warning that "bare hands would be more effective". Modifying paths ("upgrades") for instruments also have been added, and the Lyre is available.
First, stats. You want Strength for attacking with Dischord. You want lots of combat skills for using Lullaby effectively. Finally, you don't really need Dexterity, because I do not think any of the buff skills are affected by it.
Now, the skills. There are the original bard skills:
Playing Instrument: It gives a small increase in the power of your buff skills. You can either go to the 3 person shadow mission with a ring of Barrier spikes and hit the spikes until your weapon breaks, or you could rank Musical Knowledge along with Playing Instrument and with Compose make a sheet music with "r64" as the entire song, and with the "autoplay" option checked. Either way is similar in upgrade speed. Also, by rank 5 and above, playing songs to your Homestead crops is the best way to rank this skill; you want Silent Song ("r64") to spam attempts until it succeeds. This skill requires 87 AP to rank to 1.
Musical Knowledge: This skill requires books for all levels. Up to a certain rank, you can get the books from regular shops; some you need to open up secret shops, and above 9 you have to do various annoying things like "Drop from Karu Dungeon" or "Collect Corcoule Relics III". Go to the Mabinogi wiki for more information. This skill increases the chance of you playing a marvelous or haunting song, and increasing your buff's effect. You want at least 1 rank in this skill to have the ability to even play marvelous or haunting songs. Easy to rank to at least 8. Only 42 AP needed to rank this all the way to r1.
Compose: This skill is mostly for being able to create longer songs. 76 AP is needed to rank this to 1, and like Musical Knowledge the books are everywhere. Again, easy to rank to 8, then it becomes harder. This skill is not needed at all for bards, but being able to write longer songs is a nice ability to have.
There also is the Luring Ballad skill you get during one of the G...12 missions, I think, that's mostly useless.
The new skills!
Dischord: It looks good, but think twice before committing yourself. Dischord has a very long cool time, and it is functionally equal to Smash, except it also debuffs the enemy by stunning them, lowering their movement speed and dealing "poison" damage. Sounds good, but you need 120 AP to rank it, it only does 500% damage with your very weak instrument, and the poison damage is only half at rank 1, twice. I highly recommend skipping this skill.
Lullaby: Another trap, which could be good in some cases but usually isn't. Why? Let us see: at rank one, you (1) have a 75% chance of putting to sleep monsters that when you press ALT have nothing beside their name—there could be WEAKEST, or WEAK, STRONG, AWFUL, BOSS—for 9 seconds. (2) Deal 300 extra damage upon hit. (3) Can lull to sleep 15 enemies. It
sounds good. The catch is that (a) Once fallen asleep, the enemy cannot be lulled again, and (b) sleeping enemies wake after being hit. The verdict? After spending all those precious points, you
might be able to make enemies sleep, so your party can go hit them once for 300 extra damage. If you have all 15 asleep (doubtful in that tiny range) your friends might miss a few. This skill is neither here nor there, trash for solo and doubtful usage for party playing. The meager 75% chance of making equal enemies sleep will taper off rapidly for STRONG or AWFUL enemies, which are the ones who are probably going to be wanting for 300 extra damage.
Battlefield Overture: Awesome. At rank one, your allies get 20% increase in all-around melee damage, and 11% extra of that tasty critical rate. Also, if you have a decent Play Instrument rank, and have an instrument that's upgraded for +10 musical buff effects, and finally you get a Haunting performance, you can end up with +40% damage. And that's really great. Overture is useful in all situations. Costs 130 AP to r1.
Enduring Melody: Hrrm... Not bad, but not terrifically good either. This skill increases your friends' Defense (meh) and Protection (capital!); it also increases the restoration rate of mana and stamina. By rank 1, you increase Defense by 11, Protection by 5, and Mana/Stamina by 410%. Again, with Haunted/Play Instrument/upgraded instrument, you can potentially get more Mana/Stamina rate. Consider that Meditation increases mana rate by 450% at rank F, and Rest does Stamina by 150% at F. The extra stamina is useful for quick regen in-combat and between rooms for those stamina blackholes, fighters, and the mana for mages and for gathering pets. On the other hand, the protection and defense will never increase whatever you do to your instrument or other skills, so you would decrease incoming damage by 5% and then 11 (value, not percent) more. This is all good, BUT you cannot use two or more buffs at one time. Therefore, you have to pick between Overture and Melody, and in Mabinogi offense is defense. So ... it's your pick, but I think it is worth at least a 9.
I think I said this, but I'll note it again: useful when your party is resting! That's the chief usage I've put this to, to restore Stamina of my drained party members quickly.
Vivace: Trash. Utter trash. By rank 1, you get a 11% speed increase for magic and alchemy, and attack speed. But the thing is, 11% is nothing at all. Take Icebolt, the skill everyone and their dog (literally) seems to know. At rank 9, it has a charge speed of .5 seconds. With the 11% Vivace buff, it becomes .... 0.45 seconds. That much of a difference has no effect, thanks to human reaction time and server latency. Even for the longest skill charging time in Mabinogi, Fireball*5, which is 20 seconds: 18 seconds is pretty much identical to 20 seconds in that case. Lightning Bolt, with 1.0 second prep time, becomes 0.9 seconds. All-around unnoticeable to human eyes. With upgrades to the max, maybe you could get 18% decrease, which still isn't noticeable.
Don't raise this skill unless they change the speed increase amount.
Harvest Song: Another tricky one. At rank 1, you
- have the effect last for 120 seconds
- increase success rate of both you and your party members by 5%
- decrease time needed by 25%
- decrease time needed by an additional 3% per party member that is being buffed
- have an additional time decrease cap of 10%.
It also gives luck, that lovable stat which gives you critical. With Raincasting, party members, and this skill, a 99% success rate on certain items is perfectly possible. Still, don't raise this skill until you have lots of AP to burn.
March: Another "meh" skill. By r1, you get 12% faster movement for players, and 9% faster movement for mounts. This buff only applies to the pack and the handcart for Trading. 155 AP needed. With items set to max out this, you could get 18% faster movement speed. Not bad, not great. Same as Harvest Song, invest in this if you have no better place to use your AP.
Aaaaand that's it.
TL;DR?
— DO NOT rank Vivace EVER. Utter trash. Trash trash trash trash trash. No, even then.
— Dischord and Lullaby aren't recommended.
— Battlefield Overture is awesome.
— Enduring Melody is useful.
— Harvest Song and March are somewhere between useless and useful; pick as you choose.