Category:I I7 IV iv

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Lovely descending progression, quite old, used a lot. Usually followed by I V I, as it is in the Rhythm Changes

The descent is generally in the treble, with a voice following I, flat-7, 6, flat-6, so it's used when you want to get a general feeling of downward movement. (Think of the last 4 bars of Rock Around The Clock. Compare with Category:i_bVII_bVI_V.

The I7 chord is foreign, usually considered V of IV, and it leads directly into the IV chord. The minor iv chord is also foreign, but it's probably the most consistently borrowed parallel chord of all the foreign chords, and is such a frequent guest it mmight be considered an honorary home-scale chord.