:: On the potency of our songs
These are useful numbers to have for a myriad of reasons, so let's get to it. We'll assume a ~30% crit rate after SS.
Wanderer's Minuet - If you get 10 ticks of both DoTs during a WM, that's 20 ticks overall and an average of 6 procs. Add two from your EAs, and that's 8 procs.
It's not completely correct to value each proc at 140, so we'll call it 135 imagining a 3, 3 and 2 stack PP. So that's 1080 total potency over 30 seconds, making a WM at base crit worth 36 pps.
Mage's Ballad - Again we have 10 ticks, but this time a double proc means nothing. The odds of at least one DoT proc'ing at 30% crit are 51%, so we can expect 5.1 Bloodletters from our procs and another 2 from Empyreal Arrows.
Looks like 7.1 BLs total. However, note that by default we'd get 2 Bloodletters in a 30s span anyway, and those natural cooldowns will rarely be part of the picture here. So we need to subtract those two, putting us at 5.1 extra BLs. So 663p over 30 seconds gives us 22.1 pps for Ballad.
Army's Paeon - Our auto-attacks are worth roughly 28 pps, and our GCD damage averages out to... we'll say 165p / 3s = 66 pps once you're done working out Refulgents, Jaws and Straight Shot stuff. We'll toss in EA too since that's technically affected, which is 15.3 pps. So all in all 109.3 pps that's subject to Army's bonus.
Increasing that by 16% gets us a simply 17.5 pps at max stacks. For the period before that, imagining you'll spend it at an average of 2 stacks (given some EA alignment), it should be worth an average of about 8 pps with some handwave adjusting for your first EA being at likely low or no stacks.
It will take an average of 15 seconds to reach max stacks, since you have one from your first EA and then 5 dual ticks = 10 x 30% = 3 stacks on average from 15s of DoTs.
So all in all, to sum it up:
WM - 36 pps MB - 22.1 pps AP - 8 pps on-average over the first ~15s, then 17.5 pps after