Bb7+5 altered chord
Altered Bb chord for piano presented by keyboard diagrams.
Explanation: The Bb7+5 alter the Bb7 by the change of one note. Bb7+5 stands for B flat seven plus five (can also be written as Bb7#5).
Theory: Compared to Bb7 the third tone in the chord is sharpened. Notice that Bb7+5 are identical with Bbaug7.
Fingerings: little finger, middle finger, index finger, thumb (left hand); thumb, index finger, middle finger, little finger (right hand).
Notes: Bb - D - F# - Ab