SOMEONE ASKED ME:
Why is mixing Rock and Roll harder than mixing dance music? I play in a rock bar and want to mix my music.
Dance music, unlike rock is mostly created electronically, and the timing of the music is precise. If we take rock music, a drummer for example.. although they are very good it's nearly impossible to keep a consistent timing.
When you have two rock tracks rated at the same BPM (beats per minute) if you leave a transition between two songs too long.. the timing will be off hence the double beats.
Additionally many of the dance tracks and remixes have electronic beats behind them that not only make it easier for a DJ to match beats but most are somewhat non notational reducing the need to pay as much attention to harmonics.
(something I feel is very important).
Most DJ software such as Traktor, Mixmeister, Reason etc. have time stretching capabilities that help but it has to be a pretty predominate beat for the software to act on giving you that reliable mix.
SO HOW DO I MIX IT THEN?
There are several ways in which you can mix your rock music. One is to completely remix the track with a lead in and lead out beat. One caution is that most "rockers" don't like their classic rock played with.. they want the real thing. If your mix is done tastefully and not over done.. you can create a mix that's not only interesting and often more danceable, but easier to tie into your next track.
Also you get the dance crowd and the rockers on the floor!
A nice touch is adding in vocal samples from other tracks, and yes even hip hop. This seems to work best when the vocals in some way pertain to the vocals of your original track.
A good example of this is Kenny Rogers The Gambler.. with vocals from Lady Gaga's poker face.. both pertaining to poker.
The trick again is making things harmonically sound so you don't have that offish tone.
Most mixing is counted in 4-4 time and starts off to the next track on the 1st beat. You can add energy to your mixes by mixing into another key generally higher building energy, provided it's harmonically sound.
When doing this try mixing from the 3rd or 4th beat using a scratch or a sample on the first beat to keep the sense of timing - (be careful with this). This gives the impression of the same song changing key just before going into the next song. This can add energy to your dance floor and variation to your mix.
As a general rule you will want to stay with the basic 4-4 timing, too much can spell disaster, just like scratching way too much.
If you want to mix rock mainly from it's original form.. simply paying attention to harmonics and slightly faster transitions will do the trick nicely. cuts, faster transitions, fades, spin backs etc. most of which are basic DJ techniques and will make your transitions sound great.
having a bit of a musical background helps but isn't absolutely necessary if you have a good ear.
Also check out harmonic-mixing.com -If you find this information useful, please share.