1st song is always mastered free of charge so you can hear what truly professional grade mastering can do for your music.
Rates are extremely affordable and the quality definitely exceeds the cost.

Single songs are $30 and Full album projects of up to 14 songs are only $350
To get started with the free mastering offer or for more information please visit sswmastering.com - Home

MP3s are not suitable for mastering.
For an explanation of the difference between "Mixing" and "Mastering" see sswmastering.com - The Difference

Questions and requests for samples of previous work are always welcome.