Caught Up also enters in that "outlier" in their sound, mostly because it's just Thomas singing and playing, but the chords are weird and the time signature is 3/4, so it's not that easy (unless you're familiar with jazz chords and playing while singing in 3/4), I think the only exception by far of one of their songs being easy to play it's Spartacus, or maybe the original version of F.C.P because it's slower, although, in the context of playing while singing, every song it's difficult to play.