Combinations that are cool:

• Old reggeaton like daddy yankee with Jungle
• Hyp hop with jersey club, specially rap/gansta rap
• A very dreamy/ambient in the back, and a slow rock base, or a rap

Mix transition:

• Track one loop of 1 beat. Track 2 beat before drop in loop. Enter in track one beat, make it shorter, cut with reverb, change to track 2