In music perception, the human voice holds a unique role among other auditory signals, possessing several distinct advantages that set it apart from other instruments. It exhibits faster and more accurate recognition compared to other instruments and stands out in musical mixtures due to its salience. However, the underlying basis for the voice's unique role remains largely unexplained. In our previous experiments, we explored the salience of vocals and instruments in pop music samples. We discovered that vocals not only attracted significant auditory attention but also that the presence of frequency micro-modulation (FMM) in vocals played a crucial role in creating this salience. Therefore, this study aims to investigate the impact of frequency micro-modulations on the recognition of vocal and instrumental sounds, both in isolation and when accompanied by a distractor sound.