Also, just adding on to what I said, don't be afraid to use music you personally don't like, if it flows great with the video, it's what you should use unless you find a better flowing song. I'm not the biggest fan of dubstep, at all, but sometimes it was dubstep that made the montage work (never attempt with country though, not only a shitty genre but you'll never find a song that flows). Sometimes you just have to put personal preference to the side (except if you don't like country, don't put that to the side, NEVER USE COUNTRY).