The problem with mash-ups is that they tend to sound, you know, mashed up. The Sound Klash Ammo series avoids such pitfalls by marrying big tunes from both hip-hop and dancehall and adding flourishes that make them better than the originals. If you're a club DJ, can you really go wrong with Jay Z over Lil' Jon, Beyonce over the Coolie Dance riddim and Usher over the Salsa riddim? As a bonus, each volume ends with clash sounds. Anything test, dead.