The above definition is behind the times. Music is an artful rendition of ordered sounds and sometimes words which are sung or spoken. Unlike speech however, which would be a prosaic form of communication, music is an expressive form of aural communication governed by meter and pitched tones at a set standard range of intervals.
I feel it is necessary to take out the subjective qualifiers of "beauty" and "pleasingly harmonious", although I myself would prefer those to be universal.