The purpose of this study was to identify the factors that influence American music immersion (AMI) in Taiwanese English as a Foreign Language (EFL) learners and to determine if AMI is a predictor of vocabulary acquisition and American lifestyle literacy improvement during online, multimedia music study. The results of this study suggest that those subjects 29 years old and under are more immersed in American music than their 30 years old and over counterparts and that freshmen are significantly less immersed in American music than sophomores, juniors, and seniors. It was also found that those who never or occasionally watch programs in English or speak in English are significantly less immersed in American music than those who somewhat often or frequently watch programs in English or speak in English. In addition, the findings suggest that AMI alone is not a good predictor of vocabulary acquisition or lifestyle literacy improvement during online, multimedia music study. Finally, the study found that some minimal level of English competency is required to benefit from this type of multimedia learning environment. (Contains 10 figures.)