When the music is mixed and recorded, it is sent for mastering. Most of the musicians understand the importance of a well mastered track. Mastering performs some key functions like the assembly editing, sweetening of the song and the output. Assembly editing phase in mastering involves the sequencing of the tunes into the order that is specified and reducing the spaces in between the cuts. Through this, any pops, clicks or strange noises are eliminated, depending on its source and severity. Mastering sweetens the sound of music. This sweetening is done through signal processors like compressors, equalizers and limiters. Enhancing the sweetness would mean increasing the emotional intensity of the song. The clarity, smoothness, punch and impact of the song are enhanced, based on the need of the music. Once the mastering is performed on the audio tracks, they become ready to be used on any commercial medium. Mastering services are now also available online. Online audio mastering is a convenient process as it does not require visiting mastering studios for getting the tracks mastered. The tracks can be mastered easily by uploading them on the mastering sites. The process is far more affordable than attended mastering. The quality of the mastering process is in no way less than the other form. Artists today understand the urgency of mastered songs. Even the non- technical audience can make out the difference of a mastered song. mastering servicesare indispensable if the track is to make an impact on the audience. The professional touch rendered and the clarity of sound makes it an absolute necessity, that can’t be foregone.