i have nothing that's really skald-specific. it's more setups that emphasize the first song in particular, for the same reason that @Jayd pointed out in #3 (skalds are more likely to reset their chants than others); I haven't built like a wildrhymer or harbinger or some other setup that really leans into the skald's melee martial focus. (i've used konstanten as a howler, but honestly i think his stats suck too much to be a good howler or skald)
my personal skald/theurge's favorite song was:
the fox from the farmer... -> the long night's... -> come, come...
This only worked because I had a lot of disengagement-related bonuses, so I could get a pretty steep like 80-pt swing in enemy accuracy, it'd also be the first one to activate after an invocation, or switching chants. long night's combos into come, come. i also had side chants for resistance songs.
in my current party, i'm building tekehu as an SC chanter that has more of a tanky focus, and a couple of songs I set up:
silver knight -> ancient memory -> thick -> ...
with the intention eventually of doing something more like
silver knight -> the arrow sings -> with all your strength -> ...
i also have another song that's like
her courage -> ancient memory -> [i forget]...
and various resistance songs. it's not very skald specific, but the principles would work well with a skald. If I'm in trouble, I switch out of "tanky mode" and put on the "her courage" one. By being the first song, I instantly get a 10pt damage shield, and a few seconds after that, get a regen effect. As a skald, it would work better because with mroe frequent invocations, you'll refresh the damage shield more frequently and get closer to 100% uptime on ancient memory even with a third song in there. You can also switch to resistance songs. I've mentioned in another thread that I really really like "One Dozen" (con/res resistance) and there's nothing quite like it activating, resisting down a terrify/frightened or a weakened, using an invocation, and then a second later, having the song reactivate and have everything resist down to nothing.