[link to original on tumblr]
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I figured out yester-day why that note is so difficult: it's a C and the rest of the song up to that point is in A major. That C is an accidental.
I didn't realize it until writing this post, but that C kind of throws out the key that Rod Argent had been using. In a way, that C transforms the song from A major to A minor - sort of the opposite of what Chris White does in "This Will Be Our Year." But the rest of "A Love That Never Was" doesn't really even follow A minor. Because, after that, the chord progression is weird. It's something like D Dm A / B Bm / A Am / E. And, to some degree, that constant key shifting musically illustrates the despair about the titular love that never was.