A#sus4 chord
A# suspended fourth
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The A#sus4 chord has the intervals I, IV, V. Commonly used in pop, rock, and jazz, the suspended fourth chord usually has no third and therefore sounds open since it lacks a minor or major tonality. It can function as a preparatory chord before a resolution at the third.
Matching Scales: A# Major A# Minor A# Blues D# Major D# Minor D# Major Pentatonic F Minor F Blues F Minor Pentatonic