Data audification (or sonification) is the representation of data and information through sounds and melodies. Sonification can be considered as the acoustic counterpart of data graphic visualization, a mathematical mapping of information from data sets to sounds. In the past twenty years the word sonification has acquired a new meaning in the world of computer music, computer science, and auditory display application development. Data audification is currently used in several fields, for different purposes: science and engineering, education and training, in most of the cases to provide a quick and effective data analysis and interpretation tool. Although most data analysis techniques are exclusively visual in nature (i.e. are based on the possibility of looking at graphical representations), data presentation and exploration systems could benefit greatly from the addition of sonification capabilities. In addition, sonic representations are particularly useful when dealing with complex data or in data monitoring tasks where it is practically impossible to use the visual inspection. More interesting and intriguing aspects of data sonification concern the possibility of describing patterns or trends, through sound, which were hardly perceivable otherwise. Moreover in many cases human ears are used to discover slight changes in acoustic patterns. One example is the medicine who routinely applies acoustic data analysis when uses the stethoscope to listen to breath noise and heart tones.