Frequencies in producing music

[namoclay]

When i make (dance) music and play drums or sounds over eachother, is it most important thing that they are in different frequenties?
I know that panning, fx and volume is also important but is frequency the most important rule?

Thnx!

[Resonance5]

for example if you have two sounds rich in low frequencies, choose your main one and apply lowpass filter to the other one when they play together...