Do you need to mix in key?
If you are mixing two tracks with the melodies overlapping, then you should always try to mix in key as it will blend and sound so much better. However, if your mix will be completed over a drum loop. ... Mixing in key is just another tool to make you sound better as a DJ and isn't a strict rule you must abide by!
Is there a free version of Mixed In Key?
A free version of Mixed In Key is now available for download. Mixed In Key is a Windows application that finds the musical key of songs for musicians and professional DJs. Mixed In Key helps users mix songs harmonically, with no clashing vocals and harmonic elements.