Music Production/Audio Engineering
The job of a recording engineer is not only to record audio, but to edit and mix it in such a way as to make the audio sound the best it possibly can. During a recording session, he must listen to audio from both a musical and a technical perspective, looking for ways to adjust the equipment, recording levels and even the performance of the artist in such a way that the recorded product sounds perfect [Source: http://entertainment.howstuffworks.com/recording-engineer1.htm]
