Material Suspension Within an Acoustically Excited Resonant Chamber. The superheated exhaust gases exit through an acoustically resonant exhaust pipe. This sound contrasted with two acoustically similar sounds&colon; dentoalveolar and apicoalveolar . Classical music uses the natural sound produced acoustically by the instrument, as does traditional bluegrass. Stelarc is a performance artist who has visually probed and acoustically amplified his body. He is also known for using alternate guitar tunings, particularly when performing acoustically. It also has seven bonus tracks which are performed acoustically. It is one of the largest and acoustically most advanced concert halls in the world. In 1995 they released a live unplugged album and video entitled "Acoustically Yours". It includes acoustically re-recorded versions of Hagar's previously released songs. Pharyngealisation is similar in articulation to retracted tongue root but is acoustically distinct. The sighting of each predator elicits an acoustically distinct alarm call. It was opened by the band, who played five songs acoustically. This property leads to its importance in Fourier analysis and makes it acoustically unique. Brett brought life to the songs that the trio had been playing acoustically for weeks.