This research addresses lexical deficits among EFL learners by investigating the pedagogical potential of vocal training with authentic pop songs for multi-word unit acquisition. Drawing on cognitive neuroscience, the study builds on evidence that music enhances brain plasticity and that musical and linguistic syntax share neural processing regions (Patel, 2011). The intervention involved vocal training and was evaluated using paired t-tests and ANCOVA. Results showed significant vocabulary gains, with a large effect size in the t-test and a medium main effect in the ANCOVA. Additionally, statistically significant gender differences were observed at both the pre-test (T0) and post-test (T1), highlighting the differentiated impact of the music-based approach on boys and girls.