There are several cross genre tunes out there. The first that springs to mind is dirtyphonics - Polygon. This goes from 175 - 128 (or thereabouts) So making it smooth to transition into some dirty electro / dubstep or something.
Otherwise, if youre playing a bit more laid back tunes; use what the old hands use! The turntables! Turn off power, wind down deck, bring in new tune.
Anymore tunes that you can think of that have bpm changes in them?
Another way is remixes, if you have a tune thats been remixed in the genre you want to switch to then mash up the remixes.
Anymore tunes that you can think of that have bpm changes in them?
Anymore tunes that you can think of that have bpm changes in them?