By: Trevor Chartrand Rich Peppiatt’s Kneecap takes a fresh take on music biopics – a welcome approach to an otherwise tired genre. Unapologetically grimy and raw, music is the beating heart of this surprising and enticing gem.   The movie chronicles the dramaticized origin of Kneecap, the titular hip-hop band from Northern Ireland. Comprised of Irish rappers Naoise Ó Cairealláin (stage name: Móglaí Bap), Liam Óg Ó Hannaidh (Mo Chara) and their mixer JJ Ó…