A lot of listeners under the age of 18 may not have known the beat used on “Juju On That Beat” before Zay Hilfigerrr & Zayion McCall’s dance song became a viral hit. Plenty of people did recognize the sample as the 2004 club banger “Knuck If You Buck” by Crime Mob. DJ Smallz spoke with Diamond from the Atlanta-based group about a new generation of fans discovering the Crunk anthem.   “We’re blessed to still be able to have a hit record that still lives 12, 13 years later,” said Diamond. “My nieces and nephews – 14, 15 – it’s just now coming to them.” According to the Sisterhood…