The influence of auditory environments on task performance has been widely studied through cognitive models that predict interference effects. This study examines whether lyrics in preferred background music affect workplace productivity, particularly typing accuracy and speed. Twenty-two participants completed a typing task under silence and self-selected music. They were grouped by auditory work preferences - favoring lyrics or instrumental audio. While typing speed remained stable, accuracy results contradicted established models. Baddeley’s Working Memory Model predicts verbal interference, Cognitive Load Theory suggests added cognitive burden and Wickens’ Multiple Resource Theory posits competition for verbal processing resources. However, participants preferring lyrical music showed improved accuracy. These findings suggest familiarity and personal preference mitigate expected interference, challenging conventional cognitive models. This study highlights the need to reconsider cognitive frameworks in workplace ergonomics and emphasizes the role of personalized auditory environments in optimizing task efficiency.