It shows up in '80s new wave like the melodic " Don't Dream It's Over" by Crowded House and acoustic rock hits like " All I Want" by Toad the Wet Sprocket. Listen for the Bb chord in pop oldies such as " Good Vibrations" by the Beach Boys or the soulful " Now That We Found Love" by the O'Jays. Of course, the octave leap is permissible, provided that no other rules are broken.From classic rock standards to new wave hits, the Bb chord is featured in countless well-known songs. I can imagine that such a rule would create difficulty in certain circumstances. If the Ic designation implies something beyond the designations with which I am more familiar, then perhaps it is a rule in that case, but I have seen many, many instances (at least in textbook examples) in which the bass simply stayed on the same pitch. I have never heard nor seen the rule about the octave leap in the bass. Therefore, the bass must be doubled in the Ic sonority. To do otherwise would require parallel octaves in the resolution, which is (of course) forbidden in this style. That is, the sixth above the bass must go down to the fifth above the bass in the same voice, and the fourth above the bass must go down to the third above the bass in the same voice.īecause of the rules about downward resolution, the sixth and fourth above the bass may not be doubled in a four-part texture. It must resolve to the dominant ( V) chord with the suspended pitches going downward by step. The pitches happen to be the same pitches as the tonic ( I) chord would have, but the chord cannot function as tonic. Note that the intervals above the bass are (octave displacements of) a sixth and a fourth above the bass. Rather, it is a double suspension over the bass, and its resolution in common practice music needs to follow specific rules. The chord labeled Ic is not a functional chord. I admit I have never seen it called that, though I have seen a variety of other names, including I6/4, V6/4, and just plain not labeling the chord. It seems like every theory program has a different name for this Ic construction.
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