About Speaker Knockerz
Derek McAllister Jr., known professionally as Speaker Knockerz, was an American rapper and record producer. Raised in Columbia, South Carolina, he began his music career as a producer, teaching himself and selling instrumentals while still a teenager. In the early 2010s, Speaker Knockerz began rapping and releasing mixtapes. Active during the rise of internet-based hip-hop and gaining attention through self-released music and online promotion, his music gained wider attention in 2013 with the release of the song "Lonely," which spread widely on social media.
Biography source:
Wikipedia
