Sony Acid Pro 7.0
You will find about 20 different mixing, DJing and Remixing software on this site along with quite a few pages of Acapella and Instrumental master tracks for downloading that will be incredibly helpful for your remixing needs. This professional grade software uses a multi-track layering format that allows you to produce continual loops and also to edit it anyway you want. You can cut up a song and edit it as easily as editing a paragraph on MS Word. With Sony Acid Pro 7.0, you can produce your own professional grade tracks by combining instruments and layering them to produce complete tracks. You can also take your favorite songs and cut, mix, splice them to achieve your musical goals then render it as an MP3 file and this site will show you how to so just that.