šµ Contains the root, 3rd, 5th, b7th, and 11th (perfect fourth). However, the perfect 11th strongly clashes with the major 3rd, so the 3rd is almost always omitted in standard voicings, making it function more like a bVIImaj7 or minor 7th chord over the root. Use it in jazz and funk for a dense, slightly dissonant sound that often resolves to a minor or minor 7th chord.
Also abbreviated as: 11
With all 5 notes and C
as bass, it is also: A#6/9/C
Bb6/9/C
C11
Contains intervals: 1P
5P
7m
9M
11P
Popular songs which use this chord type: What's Goin' On (Marvin Gaye - G11 is voiced like Fmaj7/G), Chameleon (Herbie Hancock - Eb11 voiced like Dbmaj7/Eb)