BackgroundsThese can trip up new players. After creating a very concise trait with your One Unique Thing, what often happens is players create a set of Backgrounds related to the One Unique Thing, that when it boils down to it, are all the same.
Backgrounds are not necessarily related to your One Unique Thing. Think of them as entirely separate, at least initially.
Let's see what Gypsy, pchan, Jah and the guys came up with in that demo play.
ChorusScholar +4, Elven Spy +3, Diplomat +1
DuskoThief +5 for free (from Rogue class)
Smuggler +4, Acrobat +3, Shepherd +1
DarrardFolk Singer +4*, Retired Guardsman +3, Woodsman +1
*This is a good example of backgrounds. Darrard was actually a Fighter, but who said you have to be a Bard to carry a tune!?
KaeSeeker of Forbidden Knowledge +4, Treasure Hunter +2, Fugitive +2
VidarTracker +5 for free (from Ranger class)
Order of Curse-Eaters +4**, Dwarf Vs Food +4
**We started with no idea what a Curse-Eater is, but through play Vidar turned out to be a sort of Dwarven bloodhound, sniffing out dark magic. Curse-Eaters seemed to be sworn investigators and exterminators of such things. Sort of like pest control!
So you can see, Backgrounds should summarise your character's backstory to some extent. They don't have to be overly florid, but sometimes it's subtly important. Chorus is a Scholar, whereas Kae is a Seeker of Forbidden Knowledge, both could cover similar skills when you think about it, but it's not where they overlap that's important, it's where they differ.