So in this piece I'm working on, there is a part where the harp plays alternating C major and Ab major chords. Now, I don't know a ton about the harp, but I from what I know about its pedaling system, I think a good way to do this would be if the harpist actually plays C-Fb-G followed by Ab-C-Eb, so they don't have to switch from E to Eb in the act. My question is, how should I notate this? Should I write it in this enharmonic notation (even though it looks funky to me) or write what the notes "should" be (C-E-G, Ab-C-Eb) and trust the harpist to do the sensible thing? And should I give some warning to the harpist in the preceding rests about how their strings need to be tuned?
Thanks,
DP