The excess mucus production that triggers postnasal drip has a number of possible causes, including: 1  Colds. 2  Flu. 3  Allergies (called allergic postnasal drip). 4  Sinus infection or sinusitis (inflammation of the sinuses). 5  Object stuck in the nose (more common in children).
1. classical music-traditional genre of music conforming to an established form and appealing to critical interest and developed musical taste. classical, serious music. chamber music-serious music performed by a small group of musicians.
Definition [edit]. Atonal music is a generalizing term used to define music that seems to lack a clear tonal center. Nearly all music in the western classical tradition is considered 'tonal': that is, its harmonic structure is primarily triadic and hierarchically organized around a prominent tonal center.