when you feel like a chord suits a place better in a chart, do you feel like the original is "wrong" or "off flavor"? Specific case for example, in misty, on the 7th and 8th measure you have G-7, C7, F-7, Bb7. I can't really hear that C7 as anything else than a C-7. just makes sense to me, and it feels "wrong" to play C7. am i breaking the song?
the recording i found seems to be in a different key, so i had to switch things around a bit, but, no i doubt that your suggestion would break the song. what it would do is make that moment slightly less 'bittersweet' and more smooth. But here's something i should mention ..... it's hard to tell from your description, whether or not you have consulted the original recordings. from the recordings i've heard, which seem likely to be from the composer, the C7 you mentioned (which would actually be F7, in their key) ... actually already has a bit more to it than F7. so it's hard to tell whether you have taken that into account