I'll just use Ballad's template because as long as the weapon is one-handed (new dw) and piercing and has a 3.5+ delay, that's fine by me.
Singing Blade of Vhalen
FABLED
LORE NO-TRADE
43 str 26 sta 57 int
248 health 277 power
+15 piercing +15 disruption
Jester's Melody
Maestro's Aura
Dagger
One-Handed Piercing
Damage 52 - 521 (99.6 Rating)
Delay 3.5 seconds
Weight 3.0
Level 80
Troubador
Effects:- When Equipped, applies Jester's Melody:
On a successful attack this spell will cast Jester's Song on group (AE). This effect will trigger an average of 1.8 times per minute. Improves Spell Reuse timer by 50% for 10 seconds.
- When Equipped, applies Maestro's Aura:
When target casts a Hostile spell this has a chance to cast Maestro's Song on group (AE). This effect will trigger an average of 1.8 times per minute last 6 seconds.
Increases casting speed by of target by 50%. On every successful hostile spell, inflicts 450-650 mental damage on target.
I like Rogoshen's ideas about the short duration JC for the group and the spell haste for PoTM. I think the main procs of these weapons should be what troubadors are known for, which in my opinoin is PoTM and JC, so it would make sense to either improve upon these abilities or incorporate them as procs which affect the group.
The basis behind my proc ideas are that the first one is melee triggered which will be useful on fights like single target mobs where we mostly melee. The second proc is a spell based proc which applies a mini PoTM. The idea behind this is that you'd cast PoTM on multiple mobs and while chaining off spells, you'll proc this mini PoTM which would give your group 2 PoTM's at the same time going for a small duration with a casting speed increase. This incorporates our dual playing style giving us a melee triggered buff and a spell triggered buff.
I like Ballad's idea also with the next spell cast has a casting time of 0 for the group. That's a tight effect for a troubador weapon
Overall I think we gave the devs some good ideas to work with!