Originally Posted by: HambergIt also means A C E and C E G played at the same time. Bitonal.

Hmm...A C E and C E G played at the same time...

Let me think about what that would sound like:

A-C-E-G

Looks like a minor seventh chord to me. So it actually wouldn't be labeled Am/C, would it? Nope, it would be labeled Am7