Bb7-5 (Bb7b5) altered chord
Altered Bb chord for piano presented by keyboard diagrams.
Explanation: The Bb7-5 (or Bb7b5) alter the Bb7 by the change of one note. Bb7-5 stands for B flat seven minus five.
Theory: The Bb7-5 are identical with the Bb7 except that the fifth tone of the scale (i.e. the third tone in the chord) is flattenedThe tone is one half step lower.
Fingerings: Little finger, middle finger, index finger, thumb (left hand); thumb, index finger, middle finger, little finger (right hand).
Notes: Bb - D - E - Ab