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C maj7 means its a normal C major chord but with an added seven.Intervals are 1-3-5-7 (C-E-G-B)

C7 means its a dominant chord e.g. a flattened seven.The Intervals are 1-3-5-b7

(C-E-G-Bb)

Thus the difference is the flat seven,in this case the B flat.

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9y ago

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