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up vote 2 down vote favorite I have started reading "Jazz Theory" by Mark Levine. Note that I am a beginner so please be indulgent :) At the beginning of chapter 2 he gives examples of II-V-I chord progression. However when I read those chords I don't understand their structures. (note: now that I finished writing this post, I understand them better I think, however any insights is still very much welcome !) First example: In the key of Eb: Because the key is Eb then the II chord is a F-7, the V a Bb7 and the I a EbMaj7, this is clear. First chord: F-7 has the following four notes: F, Ab, C, Eb. On the picture I do not see those four notes but instead: F, Ab, Eb, G. From what I know it is possible to play a four-notes chord with only three voices, in that case we discard the fifth degree, thus the C. So...