Lullaby Wind Sets
Max duration
ItemSet 364379
A Kali off-handed would add 5% more duration too.
Max Magic acc
ItemSet 364378
Bihu Roundlet +3 probably slightly beats Brioso Roundlet +3 so long as you are getting the set bonus from ear. But there's not a lot in it. If you switch any other Brioso out Brioso Roundlet+3 will win from set bonus.
Recast
ItemSet 364380
Song Recast-14 between hands and legs. This is probably overkill. Especially since you'll probably have Marches. But it's useful if you have to spam a lot of lullabies.
Lullaby String sets
6 yalm radius for Horde II, full duration except instrument (489 string skill)
ItemSet 364381
Still a rather large sacrifice on Waist and ear. A Path D Kali offhanded would allow for better options.
6 yalm radius For Horde II m.acc. (488 String skill)
ItemSet 364382
Regal Earring not required because 5/5 AF. Could use a different earring or switch out a piece of AF. Probably legs for Inyanga+2/Fili Rhingrave+1. Fili Rhingrave+3 will probably be incredibly good once they come out.
6 yalm Horde II m.acc with recast. (488 String skill)
ItemSet 364383
Similar to the wind recast set. Useful for spamming when BLUs are cleaving. Favoring magic accuracy over duration though.
It requires 486 String skill to reach the 6 yalm radius on Horde Lullaby II. Horde lullaby caps at like 154 string skill so you don't need to use any string skill for that. The skill values listed assume Master Bard.
CHR+20 Magic Accuracy+30 Fast cast +10 on Cape.
Porous Rope is probably very close to Luminary Sash but Magic accuracy tends to be more reliable than CHR.
Barfawc is potentially useful as an offhand for Magic accuracy too.
String skill not giving magic accuracy is still speculation. See this JP blog:
http://noranekofantasy.blog.fc2.com/blog-entry-320.html
I'm inclined to agree though.