Q: When there is only one sharp in the key signature for treble clef, why is in on the F on the fifth line rather than the F in the first space?
A: i've never thought about that, and i don't know. but i can guess. upon closer examination i just realized that the pattern is the same whether or not it's in bass clef. if you look at the top sharp, G, right before the pattern switches, in the bass clef there seems to be no reason why it wouldn't be in the top space. so this tells me that the goal here is to not only keep them on the staff but also keep the same pattern on both clefs, for instant recognizability. i've never noticed this before but that's my best guess, after taking a closer look