blue note

musical note that is played or sung somewhat lower than usual (Music)

In jazz and blues, blue notes are notes sung or played at a lower pitch than those of the major scale for expressive purposes. Typically the alteration is a semitone or less, but this varies among performers.  Country blues, in particular, features wide variations from the tonic but still with the blue-note feeling.
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Blue Note Records is a jazz record label, established in 1939 by Alfred Lion, Francis Wolff and Max Margulis. It derives its name from the characteristic "blue notes" of jazz and the blues. Blue Note Records is currently owned by the EMI Group and in 2006 has been expanded to fill the function of an umbrella label group bringing together a wide variety of EMI-owned labels and imprints specializing in the growing market segment of music for adults (see History-Resurrection, below).
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Noun
1. a flattened third or seventh
(hypernym) note, musical note, tone
(part-holonym) blues

Eng: blue note
Urdu: نیلا سُر ۔ تیسرا اور پانچواں مدھم سُر نیلا سُر ۔ تیسرا اور پانچواں مَدھَم سُر ۔